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A family study of schizophrenia in Finland in birth cohorts born from 1950 to 1976. Family structure of families (N = 2605) with at least one sibling with schizophrenia; also siblings born before 1950 and after 1976 are included.
| N. of cases in the family | Family size | ||||||||||
| 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | |
| 1 | 3289 | 2012 | 984 | 369 | 171 | 62 | 22 | 9 | 5 | 1 | 0 |
| 2 | 282 | 271 | 190 | 82 | 35 | 16 | 12 | 5 | 1 | 0 | 0 |
| 3 | 0 | 22 | 26 | 11 | 10 | 8 | 4 | 0 | 1 | 0 | 1 |
| 4 | 0 | 0 | 4 | 2 | 1 | 1 | 1 | 0 | 0 | 0 | 0 |
| 5 | 0 | 0 | 0 | 1 | 0 | 1 | 0 | 0 | 0 | 0 | 0 |
| 6 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 0 | 0 | 0 |
