Table 1.

Descriptive statistics for psychotic‐like experience domains in each sample

Specific PE	μa	σb	Range	Skew	αc	N d	N sibse
TEDS
Paranoia and hallucinations	0.43	0.51	0–3.90	2.03	0.73	2,994	827
Anhedonia	3.19	1.54	0–9.80	0.53	0.79	2,988	821
Cognitive disorganization	3.83	2.82	0–11.00	0.51	0.77	2,987	823
Parent‐rated negative symptoms	0.88	1.19	0–9.33	2.35	0.84	2,995	833
ALSPAC
Paranoia and hallucinations	0.27	0.51	0–4.17	2.78	0.67	3,591	0
Anhedonia	1.42	1.19	0–7.00	1.09	0.73	3,591	0
Parent‐rated negative symptoms	1.57	1.11	0–7.00	0.61	0.61	4,019	0
CATSS
Paranoia and hallucinations	0.20	0.43	0–5.00	3.92	0.73	2,080	849
Cognitive disorganization	1.95	0.98	0–5.00	0.35	0.79	3,310	1,335
Parent‐rated negative symptoms	0.57	0.95	0–8.50	2.64	0.75	3,084	1,395

Note. These figures are based on the individuals remaining after quality control and were used in all subsequent genetic analyses. ALSPAC = Avon Longitudinal Study of Parents and Children; CATSS = Child and Adolescent Twin Study in Sweden; TEDS = Twins Early Development Study.

^aMean.

^bStandard deviation.

^cStandardized Cronbach's alpha.

^dNumber of genotyped individuals after exclusions.

^eNumber of siblings pairs within N.