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Table 1 Characteristics of included and excluded participants

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

  Included (total N = 333) Excluded (total N = 221)  
N Mean (SD) or % N Mean (SD) or % p-value
Demographics
 Child’s age (years) 333 13.9 (2.1) 217 15.5 (1.8) < 0.0001
 Sex (male) 157 47.2% 108 49.8% 0.55
 BMI-for-age z-score 333 0.5 (1.4) 212 0.5 (1.0) 0.79
 Number of siblings at birth 333 2.0 (1.0) 212 2.0 (1.0) 0.34
 Maternal education (years) 333 11.1 (3.0) 212 10.6 (2.8) 0.05
Marital status
 Married 245 73.6% 142 67.6% 0.14
 Not married 88 26.4% 68 32.4%