Fig. 3.

The restricted cubic spline for the association between PUFAR and odds ratio (natural log-transformed) of DR.

PUFAR: serum ω-6/ω-3 polyunsaturated fatty acids ratio; DR: type 2 diabetic patients with diabetic retinopathy; LnOR: natural log-transformed odds ratios; CI: confidence interval. Knots were located at the 5th, 50th, and 95th percentiles of PUFAR. The solid line indicates LnORs and dashed lines indicate 95%CI. Reference point at PUFAR is 35. Adjusted confounders were diabetes duration, ever insulin therapy, and systolic blood pressure.