PMCH and type 2 diabetes mellitus: Genetically predicted MCHC, MCH, and MCV levels were associated with decreased risk of T2D with an ORIVW per SD change of 0.870 (95% CI: 0.806–0.940; PIVW = 0.0004), 0.895 (95% CI: 0.846–0.947; PIVW = 0.0001) and 0.905 (95% CI: 0.851–0.963; PIVW = 0.0015) respectively.