Table 5.

Results of the meta-regression

PredictorsTypes of brain tumorsGSTM1, OR (95% CI)GSTT1, OR (95% CI)GSTP1 I105V, OR (95% CI)GSTP1 A114V, OR (95% CI)All genotypes combined, OR (95% CI)
Control sourceGlioma0.95 (0.72-1.24)1.51 (0.58-2.63)2.22 (1.40-3.53)1.18 (0.61-2.26)1.30 (1.03-1.65)
Study sizeGlioma0.64 (0.41-0.99)1.22 (0.58-2.58)8.32 (1.04-16.52)*0.93 (0.64-1.36)
Meningioma0.52 (0.23-1.35)0.57 (0.17-1.97)0.56 (0.23-1.35)
  • * All studies have >100 cases.