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Table 2 The effect of shared family-related variables on siblings' odds of developing schizophrenia: results from the multivariate logistic regression where the proband was removed from the analysis, odds ratios with 95% confidence intervals. Unique family-related variables (sex, ages of other siblings, birth order, birth cohort, maternal age, and paternal age) were also included in models as background variables.

From: Family structure and risk factors for schizophrenia: case-sibling study

Lowest age-at-onset in the sibship

 

Sex of the youngest proband (female vs. male)

0.983(0.864, 1.117)

   under 20

(reference)

   20–25

0.574(0.497, 0.664)

   26–30

0.323(0.267, 0.391)

   over 30

0.156(0.116, 0.209)

Family size

 

   2

(reference)

   3

1.128(0.943, 1.349)

   4

1.282(1.043, 1.575)

   5+

1.286(1.019, 1.623)

Mother schizophrenic(no vs. yes)

1.822(1.431, 2.321)