Data from Health and Pension Insurance Institutions
To supplement the predominantly subjective follow-up data from patients, we collected objective information about numbers of days on sick leave and details of any in-patient treatment and the diagnosis given in connection with it. The health insurance institutions record only sick leave lasting more than 3 days. The pension institutions were asked about retirements with pension and applications for pensions1. As no detailed statistical analysis was to be carried out on these data, we limited ourselves to obtaining them for a random sample of the total study population.
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