APOB and Osteopenia: In the model fully adjusted for covariates (model 3), only the positive association between serum apolipoprotein B concentration and risk of osteopenia or osteoporosis was significant in the 40–49 age group (OR:3.204; 95% CI:1.32, 7.779; p = 0.01), and each unit increase in serum apolipoprotein B concentration increased the risk of osteopenia or osteoporosis by 220% for each unit increase in serum apolipoprotein B concentration.