Fig. 2

Cubic splines for the associations of log-transformed serum BFRs with Hypertension. The horizontal dashed line represents the OR = 1.00. The red lines indicate multivariate-adjusted OR and the purple shaded area represents the 95%CI. All models were adjusted for age, gender, race, education level, PIR, serum cotinine, alcohol consumption, sleep disorders, depression, physical activity, dietary sodium intake, dietary potassium intake, BMI, eGFR, history of diabetes and NHANES cycles. lg, log-transformed; OR, odd ratio; CI, confidence interval