“…The psychosocial burden up to 18 years of age was assessed through analysis of records and register information from school health services, authorities for care of the handicapped, the Department of Child Psychiatry, social agencies and legal authorities. (For details concerning definitions, data sources and age periods covered by different sources, see Mellbin, Sundelin & Vuille 1992a. ) It was possible to categorize the whole birth cohort into one "normal" subgroup without manifest psychosocial problems, and five different subgroups with moderate or severe problems: severe mental or physical handicap, antisocial behaviour, psychiatric problems, social support, multiple problems.…”