PRL and type 2 diabetes mellitus: At phase-1, compared to men in the highest PRL category (5-34.9 ng/ml), the adjusted risk of type 2 diabetes was significantly greater in those with lower PRL levels (3-4.9 ng/ml): OR (95%CI) = 1.56 (1.03–2.37), and in those in the lowest PRL category (0.3–2.9 ng/ml): OR = 4.61 (1.82–11.66).