Figure 1

Relationship between serum selenium and total (A), LDL (B), HDL cholesterol (C), and triglycerides (D) levels. The least square (LS) means of serum lipid in the quartiles of serum selenium (<0.98 μmol/L, 0.98-1.136 μmol/L, 1.14-1.3 μmol/L, >1.3 μmol/L in serum selenium) using general linear model after adjustment for confounders in model 3. Covariates appearing in the models were estimated with the following values: age = 71.4968, sex = 0.69, BMI = 23.423, current smoking = 0.065, current drinking = 0.145, vegetarian diet = 0.03, physical activity = 332.85, hormone replacement therapy = 0.18, cholesterol-lowering medication = 0.21, vitamin supplement = 0.77, diabetes mellitus = 0.12, hypertension = 0.465. The LS means of total cholesterol increased with the increments of serum selenium (P for trend < 0.001); the LS means of log transformation of triglycerides increased with increments of serum selenium (P for trend < 0.01); the LS means of LDL cholesterol increased with increments of serum selenium (P for trend < 0.001), and the LS means of HDL cholesterol increased with increments of serum selenium (P for trend = 0.152).