Table 1 Mean Age At Menarche across birth cohorts, ethnicity, area of residence, and economic status among Yunnan women during the study period

3380(0.261)

14.119(1.405)

14.072–14.166

109,206(8.446)

13.866(1.283)

13.859–13.874

575,938(44.542)

13.755(1.233)

13.752–13.759

575,103(44.477)

13.613(1.170)

13.610–13.616

4985(0.386)

13.296(1.039)

13.267–13.325

814,111(63.852)

13.671(1.179)

13.669–13.674

152,381(11.951)

13.772(1.281)

13.765–13.778

46,448(3.643)

13.610(1.237)

13.599–13.621

38,134(2.990)

13.842(1.329)

13.829–13.856

38,420(3.013)

13.655(1.141)

13.644–13.666

37,022(2.904)

13.792(1.291)

13.779–13.805

32,857(2.577)

13.665(1.235)

13.652–13.679

24,760(1.942)

14.058(1.369)

14.041–14.075

15,487(1.215)

13.403(1.099)

13.386–13.420

13,802(1.183)

13.721(1.220)

13.701–13.741

12,679(0.994)

13.631(1.103)

13.611–13.650

41,106(3.224)

13.865(1.307)

13.853–13.878

1,231,899(96.620)

13.707(1.212)

13.705–13.709

43,094(3.380)

13.477(1.181)

13.466–13.488

343,014(26.903)

13.799(1.142)

13.795–13.803

549,681(43.112)

13.711(1.235)

13.708–13.714

382,305(29.985)

13.593(1.231)

13.589–13.597