HIF1A and type 2 diabetes mellitus: Random-effects meta-analysis was used to calculate mean differences (MD) with 95% confidence intervals (CI).<h4>Main outcomes and measures</h4>Differences in FPG, HbA1c, FINS, and HOMA-IR between high and low HIF-1α groups with T2DM.<h4>Results</h4>Thirty-six studies (<i>n</i> = 5,979) were included.