Multilevel linear regression estimates with sibling SIS-R scores for positive psychotic experiences as dependent variable and patient dichotomous YBOCS scores (> = 16 vs. <16) as independent variable.

Associations from multilevel linear regression equations, expressed as B (95% CI), p * Adjusted for confounders sex, level of education, IQ, marital status, **Additionally adjusted for age **Additionally adjusted for use of antidepressants, use of antipsychotics. Multilevel linear regression estimates with sibling SIS-R scores for positive psychotic experiences as dependent variable and patient dichotomous YBOCS scores (> = 16 vs. <16) as independent variable.