Table 2

Unadjusted means (±SE) of urinary 8-hydroxydeoxyguanosine (ng/mg creatinine) by intervention group and GST genotype

N (mean ± SE)
WaterBlack teaGreen tea
Total Population424335
 Baseline(8.7 ± 1.3)(10.8 ± 1.3)(9.5 ± 2.1)
 Month 4(11.1 ± 1.3)(13.5 ± 1.8)(7.9 ± 1.0)
GSTM1 wild182424
 Baseline(9.6 ± 2.3)(12.1 ± 1.8)(9.1 ± 1.9)
 Month 4a(11.2 ± 2.0)(14.9 ± 2.5)(7.4 ± 1.2)
GSTM1 null241911
 Baseline(8.3 ± 1.7)(9.3 ± 1.9)(12.1 ± 4.9)
 Month 4(11.1 ± 1.8)(11.9 ± 2.7)(8.5 ± 2.3)
GSTT1 wild333329
 Baseline(8.8 ± 1.6)(10.9 ± 1.3)(9.6 ± 2.6)
 Month 4a(11.6 ± 1.6)(14.2 ± 2.1)(7.3 ± 1.2)
GSTT1 null9106
 Baseline(8.8 ± 2.5)(10.3 ± 3.7)(9.1 ± 2.8)
 Month 4(11.4 ± 2.3)(8.5 ± 3.1)(10.4 ± 1.9)
  • a Between groups, P < 0.05.