ORIGINAL ARTICLES

Comparisons of self-reported and register data on sickness absence among public employees in Sweden

M Voss^1,2, S Stark², L Alfredsson^3,4, E Vingård^1,2 and M Josephson^2,4

¹ Section of Personal Injury Prevention, Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden
² Occupational and Environmental Medicine, Department of Medical Sciences, Uppsala University, Uppsala, Sweden
³ Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden
⁴ Centre of Public Health, Stockholm County Council, Stockholm, Sweden

Correspondence to:
Dr M Voss, Section of Personal Injury Prevention, Department of Clinical Neuroscience, Karolinska Institutet, SE-171 77 Stockholm, Sweden; margaretha.voss{at}ki.se

Aim: Self-reported assessments of sickness absence are often performed in epidemiological studies. The objective of this study was to compare the number of sick-leave days according to self-reported data over 12 months with data from the employer’s register for the same period. An additional aim was to ascertain whether the self-reported information and the recorded data would show equivalent associations with self-reported general health.

Methods: The study was based on a cohort of 4869 municipal employees in Sweden, about 80% women, who answered a questionnaire in 2001–2. The responses provided by the employees included information on number of sick-leave days and self-rated health. Data on sick-leave days, occupation and age were derived from the employers’ computerised registers. The questionnaire information on sick-leave days was compared with the corresponding information retrieved from the employer register by means of calculating sensitivity and specificity, using the employers’ data as the "gold standard".

Results: The annual number of sick-leave days was lower according to the self-reported information than to the register data. For women the agreement between the two sickness absence measures for no sick-leave days, 1–7 days and 28 days were 74%, 72% and 67%, respectively. The sensitivity of questionnaire versus register information regarding any self-reported sick-leave day was 91% and the specificity was 74%. Sensitivity and specificity for sickness absence 28 days were 67% and 98%, respectively. The results for men were similar to those for women. Self-reported and recorded sickness absence were both associated with self-rated health. The odds ratios were 7.27 and 8.25, for subjects with 28 recorded and self-reported number of sick-leave days respectively, compared to subjects with no sickness absence.

Conclusions: Good agreement was found between self-reported and register information on sickness absence. Self-reported data on sickness absence may be useful in common epidemiological applications.

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