AMH and hyperandrogenism: Meta-regression adjusted for phenotype, age, BMI, and region confirmed the AMH hierarchy (A > D ≈ C > B) and identified geographic region as a significant contributor to heterogeneity.<h4>Conclusion</h4>AMH levels differ markedly across PCOS phenotypes, with polycystic ovarian morphology exerting the greatest influence, followed by oligoanovulation and hyperandrogenism.