By logistic regression, the multivariable adjusted ORs for diabetes associated with the highest quartile of each OP compared with its lowest quartile were 1.70 (95% CI, 0.86–1.37) for MCP (Ptrend < 0.001), 1.82 (0.31–1.25) for CHL (Ptrend < 0.05), 1.08 (0.54–2.16) for MAL (Ptrend = 0.654), and 2.67 (1.23–2.80) for MPAR (Ptrend < 0.05) (Additional file 2: Table S6). This evidence concerns the gene MAL and diabetes mellitus.