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Table 2 Agreement between breast buds diagnosed by the girls and trained personnel, stratified by girl’s BMI z-score

From: Breast bud detection: a validation study in the Chilean Growth Obesity Cohort Study

  Girl’s Breast Tanner rating Breast Tanner rating by trained personnel
  Tanner 2 + Tanner 1 Kappa index Spearman
N (%) N (%) (95% CI)  
  Study population
Entire Study Population (n = 474) Tanner 2 24 (35.8) 132 (32.4) 0.02 (-0.06; 0.10) 0.03
Tanner 1 43 (64.2) 275 (67.6)
Total 67 407
  Stratified by girls’ BMI z-score at assessment
Girls’ BMI z-score ≤ 1DS (n = 274) Tanner 2 14 (35.9) 57 (24.3) 0.09 (0.004; 0.17) 0.09
Tanner 1 25 (64.1) 178 (75.7)
Total 39 235
Girls’ BMI z-score > 1DS (n = 200) Tanner 2 10 (35.7) 75 (43.6) -0.04 (-0.12; 0.03) -0.06
Tanner 1 18 (64.3) 97 (56.4)
Total 28 172
  1. *BMI: Body Mass Index.