Study objective: Examine the association between county occupational structure, services availability, prevalence of risk factors, and coronary mortality rates by sex, for 1980–96, in New York state.
Design: New York’s 62 counties were classified into three occupational structure categories; counties with the lowest percentages of the labour force in managerial, professional, and technical occupations were classified in category I, counties with the highest percentages were in category III. Directly age adjusted coronary heart disease (CHD) mortality rates, aged 35–64 years, (from vital statistics and census data), per capita services (Census County Business Patterns), and the prevalence of CHD risk factors (BRFSS data) were calculated for each occupational structure category.
Results: CHD mortality rates and the prevalence of risk factors were inversely associated with occupational structure for men and women. Income from manufacturing jobs declined most in category I and per capita numbers of producer services for banking, business credit, overall business services, and personnel/employment services were 9–15 times greater in category III compared with I counties. Consumer services such as grocery stores, fitness facilities, doctors offices, and social services were 1.5–4 times greater in category III compared with I counties.
Conclusions: An ecological model for conceptualising communities and health and for intervention design is discussed; key community characteristics are occupational and industrial structure, availability and diversity of consumer services, prevalence of health practices, and level of premature CHD.
- coronary heart disease
- community health
- occupational structure
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Occupational structure (that is, the set of jobs that exist in a community) is an aspect of the industrial structure and division of labour of a population and reflects the position of a local labour market in the larger state, national, and international economies. The occupational structure of United States counties is related to community economic resources and the availability and quality of local services including education, housing, transportation, recreation, and medical care.1–5 The percentage of a county labour force in white collar jobs has been used as an indicator of occupational structure2,3,4,6; an alternative indicator based on the percentage of “upper” white collar jobs (that is, managerial, supervisory, and technical/professional jobs) has more recently been used.5 The percentage of a county labour force in “upper” white collar jobs was positively associated with local economic resources (for example, county tax base and expenditures) and the availability and diversity of local services.5 This included services relevant to cardiovascular health including per capita numbers of physical fitness facilities and grocery stores. Furthermore, county occupational structure was inversely associated with premature coronary heart disease (CHD)2,4,5 and stroke mortality3 and with the prevalence of risk factors such as overweight and exercise.5
In recent decades economies of the United States and other developed countries have experienced changes in industrial structure, such that percentages of total income and employment have declined for the goods manufacturing sector and the service sector has experienced steady and substantial growth.7–11 Thus in the United States in 1992, 73% of total employment was in the service sector.11 This has been described as de-industrialisation and this transformation has influenced both occupational structure in the United States and has had an impact on geographical distributions of economic resources and services in communities.9,11,12 The service sector encompasses a wide range of activities involving, for example, taxicabs, radio and television broadcasting, gasoline stations, banks, schools, hotels and motels, child care, computer support, repair shops, libraries, legal and accounting services. A definition of service activities is further understood by distinguishing service activities from two other major industry sectors, manufacturing (that is, producing tangible goods) and extraction industries (that is, agriculture, forestry, fishing, mining).
Two broad categories of services that have implications for economic development and geographical distributions of jobs and economic resources, are consumer services and producer services. As implied, consumer services are rendered directly to people, whereas producer services are rendered to firms and represent business or commercial activity (services that appear in both categories may be distinguishable based on the source of the majority of their income). Government services (for example, social services) can represent a substantial contribution to the service sector, especially in countries with nationalised utilities and medical care. Government services are often categorised separately as they can potentially deter overall economic development when competition with privately owned services occurs. Consumer services are more apparently related to public health, for example, the availability and quality of fitness facilities, grocery stores, social services and medical care. However, producer services relate to public health by contributing to the strength of a local economy and the quality and availability of local jobs and wage levels, which indirectly supports the availability of consumer services.11
In a previous study in Washington state, an association was observed between county occupational structure, coronary mortality trends and the availability of community services in 1990.5 This study expands on previous research by examining the association between occupational structure, coronary mortality trends, and community services in New York state, and by examining changes in services availability during 1980 to 1995. In addition, this study analyses additional types of services and discusses the relevance of producer services to public health, as these activities affect the availability and quality of jobs and the strength of a local economy, including the ability of the economy to support health related consumer services.
The proportion of the civilian, employed labour force in selected white collar occupations (that is, managerial, professional speciality, and technical occupations) was used to represent the occupational structure of counties in New York state. Information on the proportion of each county labour force in managerial/professional occupations was obtained from the US Census of Population and Housing in 1980. This information was used to rank the 62 counties by the percentage of the labour force in managerial/professional occupations, and the range between the first and the 99th centiles of the distribution was divided into three occupational structure categories of equal ranges of percentages, which is consistent with previous studies.2,4,5 Counties with percentages of managerial/professional workers below the first and above the 99th centiles of the distribution were included in categories I and III, respectively. Unlike categorisation by quantiles of numbers of counties, construction of the occupational structure categories based on equal divisions of the range of percentage of managerial/ professional workers allows extrapolation of an observed pattern to the continuous variation in the occupational structure variable. Although the proportion of the labour force in the selected white collar occupations increased overall during the study period, the correlation between 1980 and 1990 distributions is 0.90, which indicates that the relative position of counties in the distribution was quite stable.
Mortality rates were calculated for New York residents, aged 35–64 years; this age group represents premature mortality13 from CHD and permits comparisons of these results with previous analyses. Deaths with underlying causes assigned to ICD-9 codes14 410–414, 402, 429.2 were included as CHD deaths. Population counts were obtained from the US Bureau of Census. Annual CHD deaths and population counts for five year age groups, from 35–64 years, were summed within occupational structure categories. Annual age adjusted CHD mortality rates were calculated by gender and occupational structure category for 1980–96. Rates were calculated by the direct method using the 1970 US population as the standard. To improve the stability of annual mortality rates by occupational structure and gender, a three year moving average was used. For example, the annual rate for 1996, represents an average of observed rates for 1994–96, the rate for 1982, represents an average of observed rates for 1980–82, etc. As data for the calculation of rates represent complete death and population counts during the study period, statistical testing of mortality rates was not used. Furthermore, as all New York counties were included and were categorised rather than randomised into occupational structure categories, there is no basis for observed associations to be attributable to chance resulting from randomisation and statistical testing of differences between categories was not conducted.
Data on populations living in urban areas, per capita income, unemployment, and median house values and education levels were obtained from the US Census of Population and Housing in 1980 and 1990. Population weighted averages of county data were calculated for each category of occupational structure. An “urban” area was defined according to the US census as having at least a population of 50 000, including areas adjacent to a metropolitan area that have greater than 2500 persons and have at least 1000 persons per square mile.15 Information on per capita earnings by industry category in 1984 and 1995 were obtained from the City and County Data Book 1988 and 1998, respectively. Information on county business services was obtained from the Census County Business Patterns for 1980, 1985, 1990, 1995. The following Standard Industry Codes (SICs) were used to represent and sum specific consumer services among counties within occupational structure categories: grocery/food stores (SICs 5400–10), fruits/vegetables markets (SIC 5430); physical fitness facilities (SIC 7991), elementary/high schools (SIC 8210), colleges (SIC 8220), vocational/job training (SICs 8240, 8290, 8330), childcare services (SIC 8350), general social services (SICs 8300–90), physicians offices/clinics (SIC 8010), dentist offices (SIC 8020), nursing/personal care facilities (SIC 8050), hospitals (SIC 8060), drug stores (SIC 5910), commercial banks/savings institutes/credit unions (SICs 6020, 6030, 6060), civic/social organisations (SIC 8640), labour organisations (SIC 8630), business organisations (SIC 8610). In addition, the following codes were used to represent and sum producer services: transportation and public utilities (SICs 4000–4999); communication (4800–90); finance, insurance, real estate (SICs 6000–6999); banking (SICs 6000–6280); business credit (SIC 6150); insurance carriers (SICs 6300–6400); real estate (SICs 6500–99); business services (SICs 7300–89); advertising (SICs 7310–19); security (SICs 7381–2); personnel/employment services (SICs 7360–1, 7363); legal (SIC 8100); architectural (SICs 8712–3); accounting (SIC 8720); management/public relations (SICs 8740–3).
Data on the prevalence of selected self reported CHD risk factors were obtained from the New York State Behavioral Risk Factor Surveillance Surveys (BRFSS) for 1991 to 1996. The BRFSS is an ongoing telephone survey of non-institutionalised New York state adults. Response data were summed across counties within each occupational structure category. These sums were weighted according to a standard methodology developed by the Centers for Disease Control, which adjusts for the number of telephone numbers and adults in each household and the demographic distribution of the sample by age, race, and gender (post-stratification weighting, weights developed by the Centers for Disease Control and Prevention). People were considered to be “physically inactive” if they reported “no leisure time physical activity” or “activity totalling less than 20 minutes per day, three days or less per week.” Men and women were considered to be “overweight” if their body mass index was greater than 27.8 kg/m2 and 27.3 kg/m2, respectively.
Characteristics of occupational structure categories
In 1980, the proportion of the labour force in managerial/professional occupations in New York counties ranged from 16% to 44% (table 1). Occupational structure category I represented counties with the smallest proportions of managerial/professional workers, 16–24%, and category III represented counties with the largest proportion of managerial/professional workers, 34%-44%. Category I represented 32% of the population of New York state and 64% of residents in these counties lived in urban areas, compared with 95% of category III residents. Mean education and income levels increased with occupational structure category; with 3.0 times the proportion of the population 25 years and older holding a (bachelors or higher) college degree in category III (31%) compared with category I counties (11%). Average annual per capita income was 1.8 times greater in category III compared with category I in 1980; and this ratio increased to 2.2 times in 1990. Per capita income from capital, investment resources (stocks, dividends, rent) was 3.2 times greater in category III compared with category I in 1980; and this ratio increased to 4.3 in 1990.
Table 2 shows the distribution of per capita earnings for goods related manufacturing and subsectors of the service industry in 1984, by occupational structure category. Per capita earnings were positively associated with occupational structure category for each industry category shown. However, the greatest disparity in per capita earnings between occupational structure category III and I was in the finance, insurance, and real estate subsector category (III/I ratio, 40.3). The disparity in per capita earnings between categories III and I was least for goodsrelated manufacturing (III/I ratio, 3.2).
Table 2 also shows the percentage of total per capita earnings represented in goods related manufacturing and service industry categories in 1984 and 1995. In all occupational structure categories the percentage of total earnings from goods related manufacturing declined substantially between 1984 and 1995, with the greatest decline observed in category I (26.1% to 16.9%). This was mainly compensated for by increasing percentages of per capita income from the subsector category services, with the greatest percentage increase observed in category I (23.1% to 33.4%). The only other industry category showing a general increase in per capita income was finance, insurance, and real estate, but the increase was largely limited to occupational structure category III (21.6% to 27.2%). Furthermore, in 1984 per capita income from this subsector was 40.3 times greater in occupational structure category III compared with I.
In 1980 there was a positive association between per capita numbers of establishments providing producer services and occupational structure, for all services shown except real estate (table 3). A pattern of dramatically greater numbers of establishments in category III compared with category I counties was apparent in 1980 and 1995 despite growth in the numbers of establishments in category I counties for many types of producer services. Especially striking in 1995, were the numbers of establishments in category III compared with category I describing banking (9.2 times), business credit (27.1), business overall (9.8), personnel and employment (20.7), and management (13.4) services. Numbers of establishments providing insurance, including medical insurance, declined in all areas, as did legal services.
Per capita numbers of establishments for consumer services, by occupational structure category, are shown in table 4. In 1980, counties in category III had the greatest per capita numbers of establishments for every service. There were 6.8 times the number of job training services, 2.7 times the number of fitness facilities, 1.6 times the number of childcare services, 1.5 times the number of grocery and fruit/vegetable markets in category III compared with category I counties. Between 1980 and 1995, there was little change in the ratio of per capita numbers of establishments between category III and I for many services shown; however, there was some decrease in the ratio describing educational services. The ratio of per capita numbers of establishments between category III and I also increased for fitness facilities (from 2.7 to 4.2), because of a decline in numbers of fitness facilities in category I counties. More modest increases in the gap between categories III and I were observed for medical and dental care establishments. In both 1980 and 1995, there were at least two times the per capita numbers of civic and social organisations, and labour and business organisations in category III compared with category I counties.
Table 5 shows age adjusted CHD mortality rates by occupational structure category in 1982 and 1996, separately for women and men. For both women and men, an inverse association between CHD mortality and occupational structure was observed, with the lowest rates observed in counties with the highest proportions of the labour force in managerial/professional occupations. Among women, the mortality rate ratio for category I compared with category III was 1.33 in 1982 and 1.66 in 1996. Among women, differences in mortality between category II and I appear small (data not shown). Among men, the mortality rate ratio for category I compared with category III was 1.18 in 1982 and 1.42 in 1996. Among women and men, the rate of coronary mortality decline during 1982–96 was positively associated with occupational structure category; such that among men, mortality in category III counties decreased 46.5% compared with 35.8% in category I counties. Women showed an even greater disparity in percentage decline by occupational structure category, with 44.4% in category III compared with 30.1% in category 1.
Prevalence of health risk factors
Table 6 shows the percentage prevalence of selected self reported health risk factors by gender and occupational structure category. Among both men and women, the highest prevalence of current smoking, overweight, and physical inactivity was among residents of occupational structure category I counties. The prevalence of overweight in occupational structure category I compared with III was 7.6 percentage points higher among men and 11.2 percentage points higher among women. A positive association in the prevalence of persons eating at least three servings daily of fruits and vegetables was observed among both men and women. There was an inverse association between poor mental health days and occupational structure category among women but not for men; men residing in category III counties reported the greatest number of such days per month during 1991.
Results from this study show that CHD mortality rates were inversely associated with level of occupational structure in New York counties, and percentage declines in rates during 1982 to 1996 were directly associated with occupational structure. In all occupational structure categories the percentage of total earnings from the industry subsector “goods related manufacturing” declined substantially between 1984 and 1995, with the greatest decline observed in category I counties (26.1% to 16.9%) (table 2). There were substantially greater numbers of establishments providing producer or business related services in occupational category III compared with category I counties, especially services providing banking (ratio III/I, 9.2) and business credit (ratio 27.1), overall business services (ratio 9.8) and personnel/employment services (ratio 14.9) (table 3). For consumer services, ratios comparing per capita numbers of establishments in category III with category I counties were less dramatic than observed for producer services but still substantial, such as grocery stores (ratio III/I, 1.5), fitness facilities (ratio 4.2), doctors offices (ratio 3.4) and social services (ratio 2.0) (table 4). Consistent with patterns of mortality and the availability of services related to health, the prevalence of selected coronary risk factors including the percentage of the population who were overweight, physically inactive, and current smokers was inversely associated with county occupational structure for men and women (table 6).
These results are consistent with a previous study in Washington state 5 that observed an association between county occupational structure, premature coronary mortality, the availability of local (mainly consumer) services, and the prevalence of risk factors related to CHD. In addition, this previous study observed an association between county occupational structure, median home values, and county tax base and expenditures, which may be expected as property taxes represent much of the funding source for county infrastructure and local communities. Thus the percentage of a community labour force in “upper” white collar jobs represents local wage, education, and skill levels of the local population, and communities with higher occupational structure are able to support higher property values and provide for greater local expenditures and infrastructure.
Compared with the manufacturing sector, the service sector has a higher share of high skill and low skill jobs but a relatively smaller share of medium skill jobs.11,16 Producer services account for most of the percentage growth in service employment, and these jobs overall require higher education levels and emphasise skills in creativity, flexibility, independence, and responsibility. There is an increasing demand for producer services as markets have become more international and unpredictable and marketing, advertising, and distribution functions have become much more demanding. Such producer services now may constitute as much as 90% of overall manufacturing costs and include product development; marketing and administration; production planning; transport and storage; other services provided within a company or obtained externally (for example, legal, accounting, specialised advertising/marketing).11 Product innovation to meet diversified and changing market demands is emphasised in today’s economy, with adaptation of products to specialised demand rather than prices being the crucial parameter of competition.11,17 However, especially in the United States the service sector also includes in absolute terms a large number of low skill, low wage service jobs (for example, sales and bank clerks, truck drivers).7,9,11
Therefore, occupational structure changes have accompanied industrial restructuring and transformation to a services economy in the United States.7,8,18 A substantial decrease in the number of goods manufacturing jobs in the United States occurred in recent decades, representing largely machine operatives occupations that tended to be medium skilled, higher paying, union jobs.8,19 However, these displaced blue collar workers typically lacked the formal education and training to qualify for better services jobs and instead tended to transition to lower wage services jobs.10,11,20–22 Furthermore, low skill, low wage service jobs are disproportionately held by women, the black population, and Hispanics.20,23–25
Therefore, transformation to a services economy, along with stagnating wages for the majority of workers may be fundamental mechanisms resulting in increasing income inequality in the United States.19,22,26 One study of income trends by education observed decreasing (real) wages during 1979–89 for all educational levels except college graduates,22 which represented only 20% of US residents in 1990 (25 years and older) and 7% with graduate or professional degrees (STF1, Census dataset). Furthermore, income inequality between higher skilled and lower skilled occupations translates into community disparities in economic resources because of differences in county occupational structure.
Producer services are highly connected with the structure of national and local economies and the importance of these activities to a local industrial structure, in addition to manufacturing, has only recently been recognised.7,11,18 Producer services provide strategic services to agricultural, manufacturing, or other services, which would be less competitive if they did not have access to these services in their proximity. This is especially true for smaller client organisations (unlike corporate headquarters that obtain such services internally) and these comparatively less sophisticated businesses are numerous and especially important in community economies located outside of major metropolitan areas. Therefore, the presence of producer services represents a business climate conducive to economic growth and overall competitiveness.9,11,27 In addition, the strength of a local economy assures adequate demand for consumer services (more immediately related to health) and the presence of consumer services contributes to the attractiveness of localities and influences the residential preferences of skilled workers.11,20,28
Several factors influence the geographical location of producer services inter-nationally and intra-nationally including proximity to clients, transportation and communication infrastructure (for example, airport, telecommunications services), access to information (for example, libraries, government documentation, computerised data), and labour force skills and education.9,11 Economies of developed countries tend to specialise in producer services such as trading, transport (for example, shipping) and investment services, especially activities such as banking and finance, insurance, scientific and professional services (such as, engineering, accounting, legal).9 Whereas, economies of less developed countries emphasise travel and other consumer type services.9 Furthermore, both the level of existing producer services and the potential for developing additional producer services in a national or local economy reflects and depends on the labour force professional skills and technical capacity.
The degree of specialisation of a producer service influences the geographical size of its market and reflects a balance between demand for the service and cost of acquiring the service, including the cost of travel and personal time spent accessing the service. This balance also is relevant to consumer services and as these services tend to be general rather than specialised (for example, grocery store, fitness facility) their sustainability is very sensitive to costs of travel and access relative to the demand for the service.11 Therefore, if motivations for health practices are relatively low in certain population subgroups,29–31 then health related services need to be more readily accessible and entail lower costs in time and travel to encourage their use and thus continued availability. This may, in part, explain the decline in per capita numbers of fitness facilities in occupational structure category I compared with increasing numbers of these establishments in categories II and III (table 4). Before the 1960s, services were located with consideration of consumer travel and time costs, which also reflected a social commitment in the United States to geographical distribution of services and equity.9,11 However, in recent decades considerations of economies of scale and profit have assumed precedence over accessibility and equity,11 which, for example, resulted in numerous hospital closings in rural areas32–34 and concentrations of medical care providers and specialists, especially in metropolitan areas.4 Therefore, increasing emphasis on profitability, sacrificing geographical equity of services, may have affected many additional services other than medical care that are directly and indirectly related to health such as grocery stores, fitness centres, childcare and education services, etc.
There are limitations of the data used in this study including a lack of information on the size of businesses and the quality of services provided. Higher costs and fewer selections of food have been documented in poorer compared with more affluent neighbourhoods.35–39 These data do not provide information on differences in the quality of services between occupational structure categories that may occur for a wide range of services including child care, physical fitness facilities, grocery stores, and medical care. Also, data were unavailable to document distributions of “backroom” producer services, which are routine, lower skilled, and lower paying producer services (for example, data entry in banking, insurance businesses),8,10 and these types of jobs are commonly located in rural and economically disadvantaged communities.9,11,40 Information on the validity of self reported CHD risk factor data by occupational structure category were unavailable. However, in a previous study the sensitivity of self reported information on smoking and obesity were 74% and 82%, respectively; specificity was reported to be at least 85%.41 Also, as the risk factor prevalence variables were collected beginning in 1991, the analysis of trends from 1980, similar to economic and services data, was not possible. As the purpose of this study was to characterise communities and not individuals and as the county was used consistently as the unit of analysis, this study was not subject to limitations of “ecological fallacy.”42–44
CHD mortality rates and the prevalence of risk factors were inversely associated with community occupational structure (% white collar jobs).
Income from manufacturing declined most in category I (fewest % white collar workers).
Per capita numbers of services for banking, business credit, overall business services, and personnel/employment services were 9–15 times greater in category III (highest % white collar jobs) compared with category I.
Consumer services such as grocery stores, fitness facilities, doctors’ offices, and social services were 1.5–4 times greater in catergory III compared with I.
An ecological model for conceptualising communities and health is discussed; key community characteristics are occupational and industrial structure, availablitity and diversity of services.
New York coronary mortality trends during 1982 to 1996 show increasing disparities in mortality between counties characterised by occupational structure (table 5). This suggests unequal distribution of those beneficial community conditions contributing to overall CHD mortality declines. Despite some improvement, substantial and persistent disparities were shown between occupational structure categories for many of the community economic and services indicators during 1980 to 1996. In the context of large disparities, correspondence between trends in community services availability and mortality trends may appear subtle and key community conditions, potentially contributing to CHD declines, difficult to identify. In addition, a lack of sufficient detail, showing specific services occupations within the services category (table 2), may obscure differential distributions of higher skilled compared with lower skilled service jobs across occupational structure categories, and changes in this distribution over time. However, influential effects are suggested by the magnitude of disparities between occupational structure categories for some characteristics such as the prevalence of college educated and the unemployment percentage (table 1); per capita income from finance, insurance and real estate services (table 2); overall availability of producer services, particularly disparities in banking and business credit services (table 3); per capita availability of education, job training and employment services and increasing disparities in medical services (table 4). Furthermore, a change in the level of disparities may not be necessary in order to result in increasing inequalities in CHD mortality, if some community conditions assume greater importance over time because of changes in regional, national, and international economies.45 Therefore, changes in the context in which effects of community conditions on health are evaluated could result in variations in the magnitude of associations at different points in time.
This ecological health model has implications for epidemiology methods examining community environments as explanations of risk factor and disease distributions46–50 and current heart disease prevention strategies that aim to address community environments.51–55 Thus, the ecological model conceptualises risk factors and CHD rates, occupational and industrial structure, consumer and producer services, and other aspects of community infrastructure to be highly interdependent. Therefore, it is not meaningful to quantify statistically “independent” contributions to health outcomes of population characteristics (for example, per capita income, percentage with college degree), risk factor prevalence (for example, percentage overweight) and community services (for example, per capita grocery stores) and community conditions (for example, housing stock quality). Rather we wish to describe how commonly these conditions coexist in communities and to better understand the relations between all of these community level characteristics and health outcomes including CHD mortality levels. By the same reasoning, health promotion programmes that seek to improve the prevalence of risk factors and selected health related consumer services but disregard characteristics of the local labour market (for example, education and wage levels; under-employment and unemployment) and other aspects of community economies (such as, industrial structure) are expected to show limited success according to this ecological model.
The strength and sustainability of a local economy reflects a complex set of conditions including the historical and current relative position of a community in larger social, political, and economic environments.9,11,12,45 Community assessments need to consider general characteristics of a local economy but should also identify specific characteristics and resources (such as, natural resources, producer and/or consumer services), which may afford a unique sustainable advantage to a given community. Results showing an association between occupational structure and CHD mortality suggest potential direct public health benefits of various development strategies including improved education and job training opportunities in economically disadvantaged communities. The United States has an especially large percentage of service workers employed in low wage, low skill jobs compared with other developed countries.7,9,11 Therefore, strategies could include improved educational, especially college, opportunities for lower income populations; decreasing overall wage differentials between “upper” white collar and other workers; tackling inadequacies of the “minimum wage” by establishing a “liveable wage,” or establishing a “basic income.”56–58 Also, economic development programmes could target disadvantaged communities to increase access to capital resources and cultivate local producer and consumer services that are accessible and tailored to strengthen other sectors of a given local economy. These types of approaches, along with more conventional cardiovascular health education and promotion programmes, may be expected to demonstrate greater efficacy as they confront multiple important and interrelated aspects of the community ecology.
Funding: this work was supported by a grant from the American Heart Association, New York State Affiliate, Inc.
Conflicts of interest: none.
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