Figure 4. The association between serum total cholesterol and lumbar spine BMD stratified by tertiles of different continuous variables. (A) Stratified by income poverty rate tertiles. Age, Sex, race / ethnicity, physical activity, blood urea nitrogen, total protein, serum uric acid, blood calcium and body mass index were adjusted. (B) Stratified by blood urea nitrogen tertiles. Age, Sex, race / ethnicity, physical activity, income poverty rate, total protein, serum uric acid, blood calcium and body mass index were adjusted. (C) Stratified by total protein tertiles. Age, Sex, race / ethnicity, physical activity, income poverty rate, blood urea nitrogen, serum uric acid, blood calcium and body mass index were adjusted. (D) Stratified by serum uric acid tertiles. Age, Sex, race / ethnicity, physical activity, income poverty rate, blood urea nitrogen, total protein, blood calcium and body mass index were adjusted. (E) Stratified by blood calcium tertiles. Age, Sex, race / ethnicity, physical activity, income poverty rate, blood urea nitrogen, total protein, serum uric acid and body mass index were adjusted. (F) Stratified by body mass index tertiles. Age, Sex, race / ethnicity, physical activity, income poverty rate, blood urea nitrogen, total protein, serum uric acid and blood calcium were adjusted.