Within the population of male individuals born in Sweden between 1970 and 1990 (N = 1270,557) and residing in Sweden at age 15, we identified all MZ (N = 1753) and DZ (N = 1263) twin pairs from the Swedish Twin Registry, and from the Multi-Generation Registry all full sibling pairs (all twin pairs are excluded) with a maximum age difference of 2 years (N = 79,208). Furthermore, we required that the twins/siblings within a pair resided together at least 80% of the time until they turned 18. 33 MZ pairs, 44 DZ pairs and 2751 full sibling pairs were excluded due to this restriction. In total we investigated 1720 MZ twin pairs, 1219 DZ twin pairs and 76,457 full sibling pairs.
