Stratification analyses of genetic susceptibility of <i>IL1B+</i>3954 polymorphism to cancer risk.

a<p>Number of studies.</p>b<p>P value of Q-test for heterogeneity test.</p>c<p>Random-effects model was used when a P value <0.05 for heterogeneity test; otherwise, fixed-effects model was used.</p><p><i>I</i>² 0–25, no heterogeneity; 25–50, modest heterogeneity; 50 high heterogeneity.