. Author manuscript; available in PMC: 2013 May 20.

Published in final edited form as: Psychol Med. 2011 Jul 7;42(1):111–123. doi: 10.1017/S0033291711001127

Table A3.

Hierarchical linear modelling of the effect of parental schizophrenia on offspring school performance in half-cousin, full cousin and half-sibling datasets using different combination of covariates.

Model 1. Half-cousin comparisons
	Covariates selections
	No covariates		Gender		With interaction^a
	Estimate	P-value	Estimate	P-value	Estimate	P-value
Intercept	−0.22	<.0001	−0.77	<.0001	−1.81	<.0001
Exposure
within extended family	−0.29	0.002	−0.29	0.002	0.17	0.561
between extended family	−0.36	0.001	−0.36	0.001	−0.25	0.011
Education
within extended family	-	-	-	-	0.18	0.004
between extended family	-	-	-	-	0.27	<.0001
Gender
Male	-	-	−0.37	<.0001	−0.37	<.0001
Female	-	-	0	-	0	-
Interaction (offspring gender × parental schizophrenia status)	-	-	-	-	−0.27	0.153
Model 2. Full-cousin comparison

Intercept	0.07	<.0001	−0.51	<.0001	−1.64	<.0001
Exposure
within extended family	−0.22	<.0001	−0.21	<.0001	−0.01	0.921
between extended family	−0.37	<.0001	−0.37	<.0001	−0.24	<.0001
Education
within extended family	-	-	-	-	0.19	<.0001
between extended family	-	-	-	-	0.31	<.0001
Gender
Male	-	-	−0.39	<.0001	−0.40	<.0001
Female	-	-	0	-	0	-
Interaction (offspring gender × parental schizophrenia status)	-	-	-	-	−0.08	0.145
Model 3. Half-sibling comparison

Intercept	−0.31	<.0001	−0.84	0.006	−1.89	<.0001
Exposure
within extended family	−0.01	0.844	0.00	0.972	0.02	0.888
between extended family	−0.15	<.0001	−0.16	<.0001	−0.06	0.073
Education
within extended family	-	-	-	-	0.17	<.0001
between extended family	-	-	-	-	0.31	<.0001
Gender
Male	-	-	−0.36	<.0001	− 0.36	<.0001
Female	-	-	0	-	0	-
Interaction (offspring gender × parental schizophrenia status)	-	-	-	-	0.018	0.834

Note:

The model adjusted for offspring gender, parental education level and an interaction term with offspring gender and exposure status.