ADIPOQ and polycystic ovary syndrome: In a meta-analysis conducted in 2020, addressing adiponectin concentrations only in lean women with or without PCOS, including 30 studies (comprising 1270 PCOS patients and 1295 controls), showed that in non-obese women, PCOS was also significantly associated with a decreased adiponectin level (SMD: −0.95; 95% CI: −1.36 to −0.53; p < 0.00001) [141].