INS and Hypertension: When stratified by hypertension history (Table S3), the highest quartile of blood Se was positively associated with FPG (β = 0.14, 95% CI = 0.05, 0.23) and insulin (β = 3.15, 95% CI = 1.38, 4.92) among those without hypertension and had positive association with HbA1c (β = 0.07, 95% CI = 0.00, 0.14) among participants with hypertension.