. Author manuscript; available in PMC: 2021 Apr 19.

Published in final edited form as: Schizophr Res. 2020 Jan 9;216:450–459. doi: 10.1016/j.schres.2019.10.039

TABLE 1.

Demographic features of cases and controls

		Schizophrenia		Controls
		n	mean (SD)	n	mean (SD)	t¹	df	p

	Age (years)	393	31.4 (9.8)	276	33.0 (9.4)	2.2	667	0.027
Age at onset (years)²	consanguineous (F>0.05)	53	21.7 (6.1)	–	–	−0.49	373	0.62
Age at onset (years)²	not consanguineous (F<0.05)	323	22.2 (6.9)	–	–	−0.49	373	0.62

		Schizophrenia		Controls
		n	percent	n	percent	Chi-square³	df	p

	Sex Ratio (Male)	268	68.70%	153	55.40%	12.1	1	0.0005
	Geographic Region (Urban)	115	30.40%	68	24.70%	2.7	1	0.1
Self-reported Consanguinity (Yes)		101	36.70%	50	18.20%	4.9	1	0.027

Two-sided Student’s t test.

Count for age at onset does not equal total cases, due to missing data in 23 individuals (Three consanguineous cases; 20 non-consanguineous cases).

Chi-square test corrected for sex, residential setting, and self-reported familial consanguinity.

F=inbreeding coefficient; n=subject count; SD=standard deviation; df=degrees of freedom; t=test statistic; p=probability.