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Mean age at menarche by year of birth in Chinese girls aged 6 to 18 born between 1973 and 2004.
Secular trends of age at menarche in 6 countries.8,17–23 Ages at menarche in the Netherlands and the United States were calculated as median age, whereas others were calculated as mean age.
Mean age at menarche by year of birth in Chinese girls aged 6 to 18 born between 1973 and 2004, stratified by rural or urban residency.
Kaplan-Meier survival probability of age at menarche among Chinese girls aged 6 to 18 born between 1973 and 2004.
Univariate and Multivariate Cox Proportional Hazard Models of Age at Menarche
Calculated with application of weights for the CHNS sample.
↵a From Kaplan-Meier survival probabilities.
↵b Adjusted for other covariates in the table.
↵c Calculated by using the median value of each category as a single ordinal variable in the Cox regression model.
↵* P < .05.
↵** P < .01.
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