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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