Table 1. Subject demographics.

Data set	MCIC	NU	MCIC/NU merged	Mean age	Age range	MCIC handedness	MCIC mean parent SES	MCIC mean years of education	rs1625579 genotypes
Controls	90 (61% Male)	42 (55% Male)	132 (59% Male)	32	14–60	82 Right 5 Mixed 3 Left	2.7, Range 1–5	15.3, range 12–21	TT=87 GT=43 GG=2
Cases	60 (75% Male)	29 (69% Male)	89 (73% Male)	34	17–61	54 Right 4 Mixed 1 Left 1 Unknown	2.6, Range 1–5	13.6, range 7–22	TT=63 GT=23 GG=3
All subjects	150 (67% Male)	71 (61% Male)	221 (65% Male)	33	21–61	136 Right 9 Mixed 4 Left 1 Unknown	2.65, Range 1–5	14.45, range 7–22	TT =150 GT=66 GG=5

Abbreviations: MCIC, Mind Clinical Imaging Consortium; NU, Northwestern University; SES, socioeconomic status.

Handedness, parent SES and subject years of education were only available for MCIC subjects. Parent SES was reported by 100% of controls and 95% of cases. Years of education were reported by 99% of controls and 93% of cases. Parent SES score was based on the following: 1= situation of wealth, education, top-rank social prestige; 2=college or advanced degree; professional or high-rank managerial position; 3=small businessman, white-collar and skilled worker; high school graduate; 4=semi-skilled worker, laborer; education below secondary level; 5=unskilled and semi-skilled worker; elementary education.