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对贵州省 8~ 2 0岁的女学生 2 537名月经情况进行调查。结果 :月经来潮率 52 74 % ;初潮最早年龄为 8岁 ,最晚年龄为 19岁 ,平均初潮年龄为 13 2 3岁 ,95%允许限为 9 94~ 15 76岁 ,95%可信区间为 13 16~ 13 80岁 ;月经持续时间平均为 4 95d ,城乡间月经持续时间有显著性差异 (P <0 0 0 1) ;月经周期平均为 30 77d ,城乡之间无显著性差异 (P >0 0 5)。
A survey was conducted on 2 537 menstruation of female students between 8 and 20 years old in Guizhou Province. Results: The menstrual cramp rate was 52 74%. The earliest menarche age was 8 years old, the latest age was 19 years. The average menarche age was 13 2 years old. The 95% allowable limit was 9 94 ~ 15 76 years old. The 95% confidence interval was 13 16 ~ 13 80 years old; the mean duration of menstruation was 4 95 days; the duration of menstruation between urban and rural areas was significantly different (P <0.01); the average menstrual cycle was 30 77 days old (P> 0 0 5).