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Background  Menstruation is a normal physiological process occurring every month throughout the reproductive age of the females. However, significant variation in menstrual pattern is observed among adolescents. The objective of this study was to determine menstrual pattern among adolescent girls of Pokhara Valley.    Method  A cross sectional study was conducted in seven schools of Pokhara Valley. A total of 260 adolescent girls were included in the study. Girls were requested to complete questionnaire containing 19 items. Selected girls voluntarily agreed to answer questionnaire under the supervision of the researcher and then the data was analyzed.    Results  Mean age of the girls was 14.0 ± 1.3 years. Mean age at menarche was 12.2 ± 0.9 years. The mean cycle length of the subjects was 34.8 ± 11.8 days. It was observed that as many as 167(64.2%) girls had irregular menstrual cycle and significant association was found between regularity of menstruation and ethnicity. Seven (2.7%) girls had a menstrual cycle length shorter than 21 days, 60(23.1%) had cycle longer than 35 days and 193(74.2%) had a normal cycle length between 21 and 35 days. Majority 231(88.8%) had normal duration of menstruation. Dysmenorrhoea was reported by more than half of the girls and significant association was found between severity of dysmenorrhoea with school absenteeism and treatment needed.    Conclusion  Dysmenorrhoea was the most common menstrual problem among adolescent girls. Girls’ school attendance was affected due to menstrual pain. Girls with severe dysmenorrhea needed medical treatment. Irregular menstruation was reported by more than half of the girls and significant association was found with the ethnicity.    Electronic supplementary material  The online version of this article (doi:10.1186/s12905-016-0354-y) contains supplementary material, which is available to authorized users.

Menstrual pattern among adolescent girls of Pokhara Valley: a cross sectional study