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Objectives: To compare the length of nonwork-related sick leave among cases managed by an insurance company versus those managed by the National Institute of Social Security (NISS)., Methods: We performed a retrospective cohort study of 289,686 cases of sick leave lasting for more than 15 days that began in 2005 after certification by a primary care physician in Catalonia, were reported to the Catalonian Institute of Medical Evaluations, and were followed to term. Of the total, 156,676 cases were managed by the NISS. To account for repeat episodes (approximately 25% of the total), the Wang-Chang estimator was used to calculate the median duration and percentiles; comparisons were made using log-logistic regression with shared gamma frailty models, with calculation of time ratios (TR) and their corresponding 95% confidence intervals (95% CI)., Results: The median duration of sick leave was 43 days for cases managed by the NISS and 39 days for those managed by the insurance company. This difference was statistically significant both for men employed under contract (TR=0.87; 95% CI: 0.85-0.88) and for those who were self-employed (TR=0.78; 95% CI: 0.75-0.80) as well as for women under contract (TR=0.85; 95% CI: 0.84-0.87) and self-employed women (TR=0.84; 95% CI: 0.81-0.88). These differences persisted after adjustment was performed for age and health region., Conclusions: For sick leave lasting more than 15 days, these results confirm that cases managed by an insurance company ended earlier than for those managed by the NISS, both for contract and self-employed workers. Further research is needed to explore the reasons for these differences., (Copyright 2009 SESPAS. Published by Elsevier Espana. All rights reserved.)

Background: Sickness absence due to non work-related conditions is a major public health issue with important socio-economic implications, and is not homogenously distributed in Spain. The objective of this study is to compare cost differences of temporary sickness absence between Barcelona and Madrid., Methods: A study was carried out based on incident cases of temporary sickness absence of more than fifteen days of duration, followed to case closure, in a retrospective cohort of workers in 2006. The study population consisted of workers of companies covered by the general regime of the Social Security System, and managed by an insurance company based in the provinces of Barcelona and Madrid in the year 2006. We compared the incidence, median duration and daily income base between Barcelona and Madrid, adjusting by sex, age and economic sector, using statistical models that take into account recurrent events in the period., Results: 24.527 cases of temporary sickness absence were identified, 62% of which originated in Barcelona. The mean cost was 33% higher in Barcelona with respect to Madrid (2.589 euros vs 1941 euros). The incidence was 22% higher in Barcelona than Madrid (1,22, IC95%: 1,10-1,36) and mean daily income base per episode was 7,80 euros higher (IC95% :7,20-8,40). In the duration the time ratio was: 1,03 ( IC95%: 1,01-1,05)., Conclusions: The higher incidence and daily income base of temporary sickness absence in Barcelona with respect to Madrid may explain the higher costs observed in the former.