Group of analysis | n†| GSTM1 (Null vs. Present*) | M# | Heterogeneity | ||
---|---|---|---|---|---|---|
OR (95% CI) | POR | I2(%) | PQ※ | |||
  Overall | 54 | 1.207(1.106-1.317) | <0.001 | R | 49.9 | <0.001 |
Ethnicity | ||||||
  Asians | 24 | 1.264(1.164-1.422) | <0.001 | R | 51.8 | 0.002 |
  Caucasians | 29 | 1.154(1.008-1.321) | 0.037 | R | 50.6 | 0.001 |
  Negroids | 1 | 1.182(0.142-9.827) | 0.887 | F | —¶ | —¶ |
Smoking status | ||||||
  Non-smokers | 14 | 1.370(1.043-1.800) | 0.024 | R | 46.7 | 0.028 |
  Ever-smokers | 14 | 1.558(1.111-2.183) | 0.010 | R | 69.6 | <0.001 |
Alcohol drinking | ||||||
  Non-drinkers | 4 | 0.872(0.623-1.220) | 0.425 | F | 0.0 | 0.757 |
  Ever-drinkers | 4 | 1.112(0.771-1.602) | 0.570 | F | 0.0 | 0.905 |
Helicobacter pylori infection | ||||||
  Helicobacter pylori negative | 7 | 0.869(0.654-1.156) | 0.334 | F | 6.8 | 0.373 |
  Helicobacter pylori positive | 7 | 1.595(1.104-2.304) | 0.013 | R | 49.9 | 0.076 |