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SP6-9 Health Survey in Campinas (ISACamp): comparison of estimates according to ownership of a residential telephone line
  1. P Francisco1,
  2. M Barros1,
  3. N Segri2,
  4. C Alves3,
  5. C Cesar2
  1. 1University of Campinas, Campinas, São Paulo, Brazil
  2. 2University of São Paulo, São Paulo, São Paulo, Brazil
  3. 3Institute of Health, São Paulo, São Paulo, Brazil


The aim of this study was to evaluate differences in the socio-demographic and health characteristics among adults (18 years or older) with and without a residential telephone line, using data from the Campinas Health Survey (ISACamp), Brazil, a population-based cross-sectional study carried out in 2008 and 2009. Descriptive statistics and χ2 tests were calculated for these variables. It also estimated the bias associated with non-coverage of the population without telephones before and after the use of post-stratification adjustments. The bias impact on the CIs of these estimates was assessed in terms of accuracy achieved. Approximately 76% of respondents owned a residential telephone line in Campinas. It was possible to identify differences in socio-demographic data for the population according to the ownership of telephone line, except for marital status. The analysed data also showed that people with telephone had higher prevalence of self-reported osteoporosis, drug use in the 3 days prior to the interview, dental visits in the last 12 months, mammography in women 40 years or more and affiliation to medical plan of health, compared to respondents without a telephone. After the post-stratification adjustment, there were reductions in the bias of estimates for those variables associated with the ownership of telephone line. In this study, except for osteoporosis, post-stratification adjustment was insufficient to correct the bias of non-coverage. Studies with samples where not all units in the target population are likely to be selected as the telephone interview, should consider the potential biases embedded in each variable.

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