Table 4.

NKCC1 genotype demographics from subjects recruited from the CBDB Sibling Study^a

	T/T	A carriers
Total	134	91
Age (years)	31 ± 9	32 ± 10
Gender	57 M; 77 F	43 M; 48 F
WAIS-IQ	107.4 ± 9.8	108.5 ± 8.5
Education (years)	16.9 ± 2.5	17.1 ± 2.8
2-back accuracy (%)	82.3 ± 15.6	81.0 ± 17.6
2-back reaction time (s)	0.50 ± 0.23	0.52 ± 0.23

^aFrom available healthy subjects with QC + fMRI data and NKCC1 rs3087889 genotypes (specific to the Δ21 transcript), there was a sample of 313 white healthy volunteers. Exclusion criteria included history of psychosis, head trauma, significant medical condition, or current psychiatric medications. The genotype groups were matched for age, gender, WAIS-IQ, N-back reaction time, and N-back performance (p > 0.05).