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Table 4 Distribution of physician-assessed secondary sex characteristicsa

From: Fluoride exposure and pubertal development in children living in Mexico City

Measure Stage N (%)
Boys
 Pubic hair 1 42 (26.8)
2 23 (14.7)
3 41 (26.1)
4 22 (14.0)
5 29 (18.5)
 Genitalia 1 9 (5.7)
2 30 (19.1)
3 32 (20.4)
4 57 (36.3)
5 29 (18.5)
 Testicular volume Yes (> = 20 ml) 101 (64.3)
No 56 (35.7)
Girls
 Pubic hair 1 16 (9.4)
2 53 (31.0)
3 44 (22.5)
4 37 (21.6)
5 21 (12.3)
 Breast 1 10 (5.9)
2 26 (15.2)
3 49 (28.7)
4 59 (34.5)
5 27 (15.8)
 Menarche Yes 137 (78.3)
No 38 (21.7)
  1. aThe sample size is 157 for each indicator of puberty in boys. For girls, 171 of 176 girls had available data on pubic hair and breast development, and 175 girls had data on menarche