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Table 2 Median Age at Tanner Stages for Breast Development by Demographics

From: Puberty timing associated with obesity and central obesity in Chinese Han girls

 

≥B2 Median Age (95% CI)

P value

≥B3 Median Age (95% CI)

P value

≥B4 Median Age (95% CI)

P value

≥B5 Median Age (95% CI)

P value

Overall

10.03 (9.80, 10.27)

–

11.38(11.26,11.49)

–

13.39(13.29,13.49)

–

15.79(15.69,15.90)

–

Place

 Urban

10.19(9.91,10.46)

 

11.26(11.11,11.41)

 

13.25(13.11,13.39)

 

15.70(15.54,15.85)

 

 Rural

9.85(9.45,10.25)

0.187

11.50(11.33,11.66)

0.043

13.51(13.37,13.64)

0.010

15.88(15.73,16.03)

0.094

WHtR

 < 0.5

10.12(9.89,10.5)

 

11.43(11.31,11.55)

 

13.48(13.37,13.59)

 

15.90(15.79,16.02)

 

 ≥ 0.5

9.00(7.60,10.41)

0.007

11.00(10.59,11.41)

0.013

12.92(12.70,13.14)

< 0.001

15.22(14.92,15.51)

< 0.001

WC

 < 90th

10.05(9.81,10.29)

 

11.41(11.29,11.53)

 

13.48(13.37,13.58)

 

15.92(15.80,16.03)

 

 ≥ 90th

8.44(4.23,12.65)

0.052

10.65(9.79,11.52)

0.001

12.77(12.48,13.07)

< 0.001

15.00(14.68,15.31)

< 0.001

BMI

 Normal weight

10.25(10.03,10.47)

 

11.54(11.42,11.66)

 

13.48(13.38,13.59)

 

15.86(15.75,15.97)

 

 Overweight

8.64(6.85,10.43)

< 0.001a

10.37(9.71,11.03)

< 0.001a

12.83(12.54,13.13)

< 0.001a

15.40(14.96,15.83)

0.019a

 Obese

8.60(6.54,10.65)

0.002b

10.66(10.00,11.31)

0.001b

12.93(12.51,13.36)

0.015b

15.16(14.67,15.66)

0.004b

  

0.975c

 

0.570c

 

0.686c

 

0.495c

  1. Abbreviations: B Breast stage, BMI Body mass index, CI Confidence interval, WHtR Waist to height ratio, WC Waist circumference
  2. aP value of comparison between overweight and normal weight
  3. b P value of comparison between obesity and normal weight
  4. cP value of comparison between overweight and obesity