GSTM1 and Osteopenia: Low LNBMD (HR, 0.00345; 95% CI, 0.00097–0.01224; p < 0.001), low Hb level (HR, 0.99113; 95% CI, 0.98289–0.99945; p = 0.037), higher PBG level (HR, 1.09922; 95% CI, 1.06192–1.13783; p < 0.001), low ALB concentration (HR, 0.82394; 95% CI, 0.79446–0.85452; p < 0.001), smoking (HR, 1.64669; 95% CI, 1.36069–1.99281; p < 0.001), tea consumption (HR, 1.58007; 95% CI, 1.24279–2.00888; p < 0.001), FLD (HR, 1.37232; 95% CI, 1.12944–1.66744; p = 0.001) were significantly associated with increased risk of osteopenia in the model.