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The age at menarche and its association with nutritional status in a rural area of Bangladesh was determined. A cross-sectional study was conducted in four villages of Rupganj Thana of Narayanganj district. Data was collected through October to December 1996 using a pre-tested structured questionnaire interview schedule, and nutritional status was measured by weight, height, body mass index (BMI) and physical examination. Data were obtained on 436 adolescent girls aged 10-17 years. Among them, 165 (37.8%) girls had commenced menarche. The mean age at menarche as determined by retrospective recall was 13 years SD 0.89 (n = 165). The median age at menarche determined by the status quo method was 13.0. Among the adolescents 60.1% were thin (BMI < 5th centile WHO recommended reference) and 48.2% were stunted (< 3rd centile NCHS/WHO). The mean weight and BMI were significantly higher among the menstruating girls of 13, 14 and 15 years (p < 0.01) than non-menstruating girls. The mean height was found to be significantly higher at 11-14 years among the menstruating girls (p < 0.05). A lower prevalence of angular stomatitis was found among the menstruating adolescent girls compared with the non-menstruating girls, 36.4% versus 46.5%, although this was statistically non-significant (odds ratio = 0.66, 95% CI 0.43-1.00). For glossitis, no significant difference was found. Among the menstruating girls 12.1% were suffering from menorrhagia and 31.5% from dysmenorrhoea. We conclude that the age of menarche among this rural Bangladeshi community is not as delayed as expected. Not surprisingly, menarche is associated with better nutritional status. The surveyed population had extremely high rates of undernutrition which suggests that adolescents in this and similar situations require specific intervention programmes to improve their nutritional status.