Table 3.

Phenotypic Correlations and Univariate and Bivariate Twin Correlations

	Tobacco
Phenotypic correlations	r	CI
Paranoia	0.19	0.15–0.24
Hallucinations	0.15	0.11–0.20
Cognitive disorganization	0.21	0.16–0.25
Grandiosity and delusions	0.01	–0.03–0.05
Negative symptomsa	0.10	0.06–0.15
Anhedonia	0.05	0.01–0.09
	MZ		DZ
Twin correlations	r	CI	R	CI
Paranoia	0.53	0.49–0.56	0.30	0.25–0.35
Hallucinations	0.43	0.38–0.47	0.29	0.24–0.34
Cognitive disorganization	0.46	0.41–0.50	0.22	0.17–0.28
Tobacco	0.82	0.76–0.87	0.68	0.60–0.75
Cross-twin cross-trait correlations (psychotic experiences and tobacco)
Paranoia	0.15	0.10–0.20	0.12	0.06–0.17
Hallucinations	0.11	0.06–0.16	0.08	0.03–0.14
Cognitive disorganization	0.18	0.13–0.22	0.11	0.05–0.16

Note: DZ = dizygotic twins; MZ = monozygotic twins.

^aParent-rated.