Table 1. Study design.
| First cohort | Siblings of adoptees dying by suicide before age 60 years | Sibling of adoptees dying by suicide before 2006 |
|---|---|---|
| Comparison cohort | Siblings of adoptees surviving to age 60 years | Sibling of adoptees surviving to 2006 |
| Number of included adoptees with siblings | 173 suicides 1403 survivors | 196 suicides 1110 survivors |
| Follow up of adoptees | From 1 Jan 1917 until 1 April 2006 | From 1 Jan 1917 until 1 April 2006 |
| Number of included siblings | 6,178 87 suicides | 5,139 60 suicides |
| Follow up of siblings |
|
From 1 Jan 1895 until 31 Dec 2009 |