Table 3.
Meta-analysis results of individual studies included in this meta-analysis
| Variables | No. of studies | Allele model | Dominant model | Heterozygous model | Homozygous model | Recessive model | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| OR(95%CI) | P value | I2 (%) | OR(95%CI) | P value | I2 (%) | OR(95%CI) | P value | I2 (%) | OR(95%CI) | P value | I2 (%) | OR(95%CI) | P value | I2 (%) | ||
| Total | 22 | 1.07(0.95,1.20) | 0.000 | 58.4% | 1.08(0.91,1.27) | 0.000 | 62% | 1.06(0.89,1.27) | 0.000 | 62.2% | 1.15(0.91,1.46) | 0.002 | 53.2% | 1.10(0.88,1.36) | 0.001 | 54.3% |
| Ethnicity | ||||||||||||||||
| Asian | 15 | 1.19(1.06,1.34) | 0.057 | 39.7% | 1.27(1.06,1.52) | 0.042 | 42.4% | 1.23(0.99,1.51) | 0.013 | 50.3% | 1.36(1.03,1.80) | 0.021 | 47.6% | 1.21(0.92,1.59) | 0.002 | 59.1% |
| Caucasian | 6 | 0.84(0.68,1.04) | 0.012 | 67.5% | 0.78(0.56,1.07) | 0.001 | 76.1% | 0.79(0.56,1.12) | 0.001 | 76.3% | 0.81(0.59,1.11) | 0.240 | 25.9% | 0.84(0.67,1.06) | 0.544 | 0.0% |
| Africa | 1 | 0.87(0.45,1.70) | - | - | 0.77(0.31,1.88) | 0.75(0.30,1.88) | - | - | 0.93(0.14,6.32) | - | - | 1.09(0.17,6.91) | - | - | ||
| Tumor stage | ||||||||||||||||
| ≥pT2 vs <pT2 | 9 | 1.39(0.94,2.05) | 0.001 | 70.1% | 1.66(0.90, 3.08) | 0.000 | 71.7% | 1.60(0.87,2.94) | 0.002 | 67.6% | 1.94(0.93,4.05) | 0.013 | 58.8% | 1.43(0.98,2.10) | 0.396 | 4.7% |
| Ethnicity | ||||||||||||||||
| Asian | 6 | 1.68(1.04,2.71) | 0.001 | 76.5% | 2.46(1.08,5.61) | 0.000 | 77.5% | 2.32(1.04,5.14) | 0.002 | 73.4% | 2.66(1.04,6.81) | 0.006 | 69.4% | 1.46(0.92,2.33) | 0.287 | 19.3% |
| Caucasian | 3 | 0.89(0.57,1.39) | 0.556 | 0.00% | 0.76(0.43,1.36) | 0.980 | 0.0% | 0.74(0.40,1.37) | 0.867 | 0.0% | 1.05(0.41,2.68) | 0.452 | 0.0% | 1.28(0.48,3.39) | 0.337 | 8.0% |
| Tumor grade | ||||||||||||||||
| ≥G3 vs G1+G2 | 5 | 1.16(0.86,1.58) | 0.195 | 33.9% | 1.29(0.75, 2.23) | 0.100 | 48.6% | 1.25(0.76,2.07) | 0.184 | 35.6% | 1.55(0.70,3.41) | 0.110 | 47.0% | 1.25(0.78,1.99) | 0.379 | 4.9% |
| Ethnicity | ||||||||||||||||
| Asian | 4 | 1.20(0.86,1.68) | 0.139 | 45.4% | 1.40(0.75,2.62) | 0.057 | 60.0% | 1.33(0.73,2.41) | 0.106 | 51.0% | 1.66(0.69,3.96) | 0.064 | 58.7% | 1.27(0.74,2.19) | 0.258 | 25.7% |
| Caucasian | 1 | 0.74(0.22,2.47) | - | - | 0.82(0.21,3.28) | - | - | 0.94(0.23,3.79) | - | - | 0.63(0.03,14.56) | - | - | 0.65(0.03,14.58) | - | - |
| Smoking status | ||||||||||||||||
| No-smoking vs smoking | 5 | 1.40(1.06,1.84) | 0.706 | 0.0% | 1.72(1.18,2.50) | 0.897 | 0.0% | 1.77(1.19,2.64) | 0.909 | 0.0% | 1.53(0.83,2.79) | 0.501 | 0.0% | 1.21(0.70,2.11) | 0.425 | 0.0% |