APOA1 and endometriosis: Univariable MR analysis indicated that among the five included lipid traits, ApoA-1 (OR = 0.893, 95% CI: 0.817–0.975, P = 0.013), HDL cholesterol (OR = 0.899, 95% CI: 0.824–0.981, P = 0.018) and TG (OR = 1.159, 95% CI: 1.054–1.275, P = 0.002) had causal effects on endometriosis.