PMC

Sibling recurrence-risk ratio for schizophrenia from statistical modelling, conditioned on the matching factors of age, gender and year of birth. Point estimates as filled circles surrounded by two-sided 95% confidence intervals as boxes. Exact numbers are given to the right.

Sibling recurrence-risk ratio for schizophrenia according to proband age at onset in cohorts from 1932 and 1960 onwards.
Note: The recurrence-risk ratio for the age category > 40 years in the cohort from 1960 was not estimable because of the short follow-up.

General population (male/female)
Patients with schizophrenia
Sibling recurrence-risk ratio of schizophrenia was calculated comparing exposed/non-exposed siblings (indicated by black arrows). Further, we estimated risk ratios for different levels of individual and parental covariates of the exposed/non-exposed sibling and for different age at onset of the proband.