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    Thyroid stimulating hormone (TSH) concentrations and menopausal status in women at the mid-life: SWAN

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    objective We evaluated menopausal symptoms, menstrual cycle bleeding characteristics and reproductive hormones for their associations with thyroid stimulating hormone (TSH) concentrations in women at the mid-life from five ethnic groups. methods This report is from the baseline evaluation of the Study of Women's Health Across the Nation (SWAN), a community-based multiethnic study of the natural history of the menopausal transition. Enrollees were 42–52 years old (pre- and early perimenopausal) African American, Caucasian, Chinese, Hispanic and Japanese women ( n  = 3242). Enrollees were interviewed about self-reported diagnosed hypo- and hyperthyroidism or thyroid treatment, menopausal symptoms and menstrual cycle bleeding characteristics. Serum was assayed for TSH, oestradiol, testosterone, FSH and SHBG. results There were 6·2% of women with TSH > 5·0 mIU/ml and 3·2% with TSH  5·0 mIU/ml ( P  < 0·008) or < 0·5 mIU/ml ( P  < 0·02). Women with TSH values outside the range of 0·5–5·0 mIU/ml were more likely to report shorter or longer menstrual periods ( P  = 0·004 for both) than women within that range. FSH, SHBG, dehydroepiandrosterone sulphate (DHEA-S), testosterone, and oestradiol concentrations were not associated with TSH concentrations. conclusion In mid-aged women, there was a 9·6% prevalence of TSH values outside the euthyroid range of 0·5–5·0 mIU/ml. Although TSH was associated with bleeding length and self-reported fearfulness, it was not associated with indicators of the menopausal transition, including menopausal stage defined by bleeding regularity, menopausal symptoms or reproductive hormone concentrations.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/73917/1/j.1365-2265.2003.01718.x.pd
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