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. 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

Figure 2. The intra-class correlation is greater between MZ twins than DZ twins for GSH, GSSG, and Ehc.

Figure 2

(♦) are the measured values for GSH, GSSG or Ehc. (−) is the mean value for a twin pair. In our population, the ICC values for MZ twins were: 0.56 for GSH, 0.36 for GSSG, and 0.63 for Ehc. The ICC values for DZ twins were: −0.03 for GSH, −0.3 for GSSG, and −0.26 for Ehc. The consistently stronger correlation for MZ twins over DZ twins is consistent with a heritable trait. Values are the median of independently processed samples (n = 3).