. Author manuscript; available in PMC: 2014 Dec 1.

Published in final edited form as: Free Radic Biol Med. 2013 Aug 9;65:10.1016/j.freeradbiomed.2013.08.002. doi: 10.1016/j.freeradbiomed.2013.08.002

Table 3.

Intra-class correlation coefficients for GSH, GSSG, tGSH, and E_hc

Trait	Monozygotic (MZ) (n=14)^a	Dizygotic (DZ) (n=5)^a	p value^b	Heritability (h²)^c
GSH	0.56 (0.11–0.83)	−0.03 (−0.78–0.80)	0.39	57
GSSG	0.36 (−0.15–0.73)	−0.30 (−0.86–0.67)	0.37	51
tGSH	0.56 (0.09–0.83)	−0.17 (−0.77–0.80)	0.29	63
E_hc	0.63 (0.20–0.86)	−0.26 (−0.85–0.70)	0.19	70
Height	0.94 (0.83–0.98)	−0.37 (−0.88–0.62)	0.01	96
BMI	0.97 (0.93–0.99)	0.92 (0.54–0.99)	0.18	63

Intra-class correlation coefficients, values in parentheses are 95 % confidence intervals.

Two-tailed value for Fisher r-z transformation.

h² = (ICC_mz - ICC_DZ) / (1 - ICC_DZ) [24]