J Epidemiol Community Health 2000;54:827-833 ( November )

Research report

Fatigue in the Danish general population. Influence of sociodemographic factors and disease Torquil Watt^a, Mogens Groenvold^b, Jakob Bue Bjorner^c, Vibeke Noerholm^d, Niels-Anton Rasmussen^e, Per Bech^d

^a Institute of Public Health, University of Copenhagen, Blegdamsvej 3, DK-2200 NV Copenhagen, Denmark, ^b Department of Palliative Medicine, Bispebjerg Hospital, Copenhagen, Denmark, ^c National Institute of Occupational Health, Copenhagen, Denmark, ^d Psychiatric Research Unit, Frederiksborg General Hospital, Hilleroed, Denmark, ^e Mood Disorders Research Unit, Psychiatric Hospital in Aarhus, Aarhus, Denmark

Correspondence to: Dr Watt (T.Watt{at}pubhealth.ku.dk)

Accepted for publication 3 April 2000

OBJECTIVETo measure the levels of fatigue in the general population, and to examine how disease and sociodemographic factors influence fatigue.
DESIGNCross sectional questionnaire study in the Danish general population.
SUBJECTSA random, age stratified sample of 1608 people aged 20-77 with an equal gender distribution (response rate 67%).
MAIN OUTCOME MEASURESFive fatigue scales from the questionnaire Multidimensional Fatigue Inventory: General Fatigue, Physical Fatigue, Reduced Activity, Reduced Motivation and Mental Fatigue.
RESULTSFatigue scores were skewed towards absence of fatigue. The General Fatigue and Physical Fatigue scales showed the highest fatigue levels while the Reduced Motivation scale showed lowest levels. Gender differences in fatigue scores were small, but the variability among women was higherthat is, more women had high scores. A multiple linear regression analysis showed that respondents of low social status and respondents with a depression had high fatigue scores on all scales, independent of other factors. Chronic somatic disease had an independent direct effect on Mental Fatigue, but for the rest of the scales, the effect of somatic disease depended on age, gender and/or whether the person was living alone. For example, General and Physical Fatigue decreased with age among healthy people, whereas scores on these scales increased with age among those with a somatic disease.
CONCLUSIONSPhysical and mental diseases play essential parts for the level of fatigue and as modulators of the associations between sociodemographic factors and fatigue. These interactions should be taken into account in future research on fatigue and sociodemographic factors and when data from clinical studies are compared with normative data from the general population.


Keywords: fatigue; general population

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© 2000 by Journal of Epidemiology and Community Health
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