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Sibship size and mental illness.

1. This study is based on a sample of 6,795 psychiatric referrals to the North-Eastern Region of Scotland and of 3,425 subjects from the general population.

2. In both the psychiatric and the control sample a marked and significant relationship was demonstrated between year of birth and family size.

3. In the psychiatric sample an equally marked and significant relationship was demonstrated between social class of parent and family size.

4. The family size distributions of the psychiatric and control samples were strikingly similar, suggesting that there is no relationship between mental illness and family size.

5. When allowance was made for differences in age distribution among diagnostic groups the diagnostic distribution within each family size group did not differ from the expected.