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Participation of subjects in the 30-year longitudinal follow-up study of children in risk of neurodevelopmental disorders. Cases excluded due to death or severe handicap are not shown. Total number of potential participants was 994 at 5 and 9 years, and 864 at 16 and 30 years. Attrition thus was 16% at five, 24% at nine, 35% at 16 and 46% at 30 years. Numbers on the left column indicate participation at different age levels.
