Parental separation at birth and depression in adulthood: a long-term follow-up of the Finnish Christmas Seal Home Children

The index cohort consisted of 3020 subjects born in 1945-1965 in Finland, isolated from their family due to tuberculosis in the family and placed in special nurseries, immediately after birth, for an average time of 7 months. Those subjects alive at 1 January, 1971 were identified. For every index subject two reference subjects were chosen, the matching criteria being sex, year of birth and place of birth. Data on depression were obtained from the Finnish Hospital Discharge Register by the end of year 1998. In males, 4.2% of the index subjects and 2.6% (Adjusted Rate Ratio RR 1.7, 95% CI 1.3-2.3) of the reference subjects had been treated in hospital due to a depressive episode. In females the respective figures were 3.9% for index subjects and 3.6% (RR 1.1, 95% CI 0.8-1.5) for reference subjects. CONCLUSIONS: The index subjects had an elevated risk for hospital treated depression in adulthood.