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Table 3 Agreement between breast buds diagnosed by the girls’ mother and trained personnel, stratified by girl’s BMI z-score and mother’s schooling

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

  Mother’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 = 341) Tanner 2 49 (89.1) 22 (7.7) 0.73 (0.63; 0.82) 0.74
Tanner 1 6 (10.9) 264 (92.3)
Total 55 286
  Stratified by girls’ BMI z-score at assessment
Girls’ BMI z-score ≤ 1DS (n = 204) Tanner 2 27 (87.1) 11 (6.4) 0.74 (0.65; 0.83) 0.74
Tanner 1 4 (12.9) 162 (93.6)
Total 31 173
Girls’ BMI z-score > 1DS (n = 137) Tanner 2 22 (91.7) 11 (9.7) 0.71 (0.62; 0.81) 0.73
Tanner 1 2 (8.3) 102 (90.3)
Total 24 113
  Stratified by mother’s schooling
Mother’s schooling < 8 years (n = 123) Tanner 2 23 (88.5) 11 (11.3) 0.69 (0.59; 0.79) 0.70
Tanner 1 3(11.5) 86 (88.7)
Total 26 97
Mother’s schooling ≥ 8 years (n = 216) Tanner 2 26 (89.7) 10(5.4) 0.77 (0.68; 0.85) 0.77
Tanner 1 3 (10.3) 177 (94.7)
Total 29 187
  1. *BMI: Body Mass Index.