We investigated the usefulness of amenorrhoea as a criterion in eating disorder diagnoses. Menstrual history, eating disordered behavior and weight history of 251 female eating disorder inpatients were assessed on admission to hospital. Menstrual status of 88 (35%) could not be assessed (80 taking hormonal contraception, 5 (< 16 years) had never menstruated, one hysterectomized, 2 postmenopausal). Of the remaining 163; 90 had secondary amenorrhoea (no periods for > 3 months), 19 irregular periods and 54 regular cycles. Some patients with recent changes in energy status, who warranted inpatient treatment for their eating disorder did not develop amenorrhoea until later during their admission. Menstrual disturbance is not limited to anorexia nervosa, 24% of patients with an eating disorder not otherwise specified (EDNOS) and 15% of bulimic patients had amenorrhoea/oligomenorrhoea on admission. The best predictors (82% cases, 83% noncases, R2 = 0.41) of secondary amenorrhoea at admission, were; current BMI < or = 18, and having rules for exercising. Menstrual status of women with an eating disorder diagnosis cannot always be assessed, is mostly measuring low body weight and exercise and is not useful in planning or initiating treatment. There is insufficient evidence to support the use of amenorrhoea as a criterion for any eating disorder.
BACKGROUND: The aim of this study was to investigate the predictors of amenorrhoea self-reported by patients who are suffering or recovering from eating or exercise disorders. METHODS: Menstrual status, eating and exercise behaviours and feelings, and weight history of 268 female patients, 16-40 years old and not taking oral contraception or hormone replacement, were assessed on admission to hospital or 12 months later. RESULTS: Most (134) had secondary amenorrhoea, 39 had oligomenorrhoea and 95 regular spontaneous menses. Amenorrhoea occurs in women with all types of eating disorder diagnoses including EDNOS (eating disorder not otherwise classified). The predictors of secondary amenorrhoea were: lower current BMI [odds ratio (OR) 0.59, confidence interval (CI) 0.50-0.68); a greater amount of body weight lost (OR 1.19, CI 1.06-1.33); exercising for mood, to burn up energy or for body image reasons (OR 1.50, CI 1.14-1.97); and younger age (OR 0.93, CI 0.87-1.00). Eating disorder patients with an exercise disorder were significantly more likely to report trying to reduce their food intake, to feel compelled to exercise and to have amenorrhoea/ oligomenorrhoea than eating disorder patients without an exercise disorder. CONCLUSION: The greater the self-report behaviours and feelings associated with energy debt, the more likely menstruation is to be disturbed. Energy balance needs to be assessed in all amenorrhoeic patients.
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