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Table 2 Yearly changes in age at menarche overall and in each 10-year birth cohort by region and education for women born in southeastern China between 1955 and 1985

From: Secular trends in age at menarche among women born between 1955 and 1985 in Southeastern China

Variables Overall 1955–65 1966–75 1976–85
Coefficient [95% CI] Coefficient [95% CI] Coefficient [95% CI] Coefficient [95% CI]
All * −0.033 [−0.033, −0.032] −0.038 [−0.046, −0.030] −0.043 [−0.045, −0.042] −0.032 [−0.034, −0.031]
Region     
Urban −0.027 [−0.029, −0.026] −0.044 [−0.068, −0.019] −0.040 [−0.044, −0.036] −0.028 [−0.033, −0.023]
Rural −0.034 [−0.034, −0.033] −0.038 [−0.046, −0.029] −0.044 [−0.046, −0.043] −0.033 [−0.035, −0.032]
Education     
High school or above −0.031 [−0.032, −0.030]§ −0.061[−0.084, −0.037] −0.036 [−0.040, −0.033]§ −0.027 [−0.030, −0.023]§
Middle school −0.033 [−0.034, −0.032]§ −0.040 [−0.052, −0.028] −0.043 [−0.045, −0.041]§ −0.035 [−0.037, −0.032]§
Primary school or less −0.040 [−0.042, −0.038]§ −0.030 [−0.042, −0.019] −0.050 [−0.054, −0.047]§ −0.047 [−0.054, −0.040]§
  1. *Adjusted for region, education and age at registration.
  2. Adjusted for education and age at registration.
  3. Significant P < 0.05 interactions detected between region and birth year.
  4. Adjusted for region and age at registration.
  5. §Significant P < 0.05 interactions detected between education and birth year.