TNFRSF11B and osteoporosis: At the same time, the female menopause (C vs T: p = 0.016; CC vs. TT: p = 0.041; TC + CC vs. TT: p = 0.020; CC vs. TT + TC: p = 0.038), sample size (TC + CC vs. TT: p = 0.037) and sex (TT + CC vs. TC: p = 0.045) were the sources of heterogeneity between the OPG T950C polymorphism and the risk of osteoporosis.