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Characterizing Discrete Subsets of Polycystic Ovary Syndrome as Defined by the Rotterdam Criteria: The Impact of Weight on Phenotype and Metabolic Features

Reproductive Endocrine Unit (C.K.W., J.A., W.F.C.), Department of Medicine, Massachusetts General Hospital, Boston Massachusetts 02114; ÞJÓNUSTUMIiSTÖ RANNSÓKNAVERKEFNA (H.P., G.G., G.I.), NÓATÚN 17, 105 Reykjavík, Iceland; and Department of Obstetrics and Gynecology (J.A.G.), Landspitali University Hospital, and ARTmedica IVF (G.A.), 101 Reykjavík, Iceland

Address all correspondence and requests for reprints to: Corrine Welt, Reproductive Endocrine Unit, BHX 511, Massachusetts General Hospital, 55 Fruit Street, Boston, Massachusetts 02114. E-mail: cwelt{at}partners.org.

Context: The Rotterdam criteria for polycystic ovary syndrome (PCOS) defines discrete subgroups whose phenotypes are not yet clear.

Objective: The phenotypic characteristics of women in the PCOS subgroups defined by the Rotterdam criteria were compared.

Design: The study was observational.

Setting: Subjects were studied in an outpatient setting in Boston and Reykjavik.

Patients: Four subgroups of subjects with PCOS defined by 1) irregular menses (IM), hyperandrogenism (HA), and polycystic ovary morphology (PCOM, n = 298); 2) IM/HA (n = 7); 3) HA/PCOM (n = 77); and 4) IM/PCOM (n = 36) and a group of controls (n = 64), aged 18–45 yr, were examined.

Intervention: Subjects underwent a physical exam; fasting blood samples for androgens, gonadotropins, and metabolic parameters; and a transvaginal ultrasound.

Main Outcome Measures: The phenotype was compared between groups.

Results: Ninety-seven percent of women with IM/HA had PCOM. Therefore, the groups with and without PCOM were combined. The Ferriman-Gallwey score and androgen levels were highest in the hyperandrogenic groups (IM/HA and HA/PCOM), whereas ovarian volume was higher in all PCOS subgroups compared with controls, as expected based on the definitions of the PCOS subgroups. Body mass index and insulin levels were highest in the IM/HA subgroup.

Conclusions: Subjects with PCOS defined by IM/HA are the most severely affected women on the basis of androgen levels, ovarian volumes, and insulin levels. Their higher body mass index partially accounts for the increased insulin levels, suggesting that weight gain exacerbates the symptoms of PCOS.

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