Table A2.

H² of psychiatric diagnoses based on ICD 8, 9 , and 10, with the younger sibling being at least as old as the median age of diagnosis

	Frequencies
	Full siblings			Maternal half-siblings				Tetrachoric correlation
	Cases	Controls	Prevalence (%)	Cases	Controls	Prevalence (%)	Median age of disorder onset	Full sibs	Maternal half sibs	h2
Schizophrenia	14 188	2 335 292	0.60	967	112 193	0.85	34	0.326 (0.010)	0.053 (0.059)	0.564 (0.050)
Bipolar	14 496	2 184 334	0.66	998	103 240	0.96	37	0.297 (0.011)	0.166 (0.048)	0.525 (0.197)
ADHD	10 452	408 760	2.49	2308	21 324	9.77	16	0.455 (0.009)	0.257 (0.024)	0.807 (0.104)
Autism	4900	414 312	1.17	653	22 979	2.76	16	0.410 (0.015)	0.223 (0.049)	0.748 (0.204)
MDD	82 840	2 063 646	3.86	6642	94 294	6.58	38	0.169 (0.004)	0.108 (0.016)	0.242 (0.065)
Anorexia	8706	3 277 732	0.26	700	177 898	0.39	16	0.211 (0.019)	0.115 (0.075)	0.375 (0.309)
OCD	9478	2 751 410	0.34	781	139 567	0.56	26	0.222 (0.016)	0.155 (0.053)	0.267 (0.220)
SUDS & Alcohol	66 035	2 080 451	3.08	6481	94 455	6.42	38	0.265 (0.005)	0 .177 (0.015)	0.351 (0.065)

Note. Standard errors are presented in parentheses.

Sex and age were regressed out from all disorders.

For ADHD and autism, birth year was limited to 1990 or higher.

Youngest sibling being at least as old as disorder median age of onset or later.