Fig. 2

Association between TG and low HDL-C levels, allowing for nonlinear effects, with 95% CIs./ The RCS function was designed with 4 knots according to TG distribution. Curves show ORs compared with the chosen reference TG level of 147 mg/ dL. The ORs and 95% CIs of the RCS model with four knots for TG were 0.39 (CI 0.33–0.47) for 70 mg/ dL, 0.83 (CI 0.80–0.87) for 121 mg/ dL, 1.11 (CI 1.04–1.18) for 176 mg/ dL, and 1.62 (CI 1.38–1.91) for 304 mg/ dL. HDL-C: high-density lipoprotein cholesterol; TG: triglyceride; RCS: restricted cubic spline; OR: odds ratio; CI: confidence interval