Table 1 Characteristics of the sample

From: Infant antibiotic exposures and early-life body mass

Characteristics a Mean (s.d.) or %
Birth weight (g) (n=11 532) 3477±460
Weight-for-length Z-score at 6 weeks (n=11 814) −0.55±1.24
Weight-for-length Z-score at 15 months (n=11 065) 0.44±1.04
Weight-for-length Z-score at 23 months (n=10 183) 0.63±1.03
BMI Z-score at 38 months (n=9443) −0.31±1.09
BMI Z-score at 7 years (n=8210) 0.15±1.03
Overweight at 38 months (%) (n=9443) 18.0
Overweight at 7 years (%) (n=8210) 23.9
Obese at 38 months (%) (n=9443) 8.4
Obese at 7 years (%) (n=8210) 8.6
Antibiotic use between 0–5 months (%) (n=10 745) 31.9
Antibiotic use between 6–14 months (%) (n=10 388) 53.6
Antibiotic use between 15–23 months (%) (n=9789) 47.5
Antibiotic use between 0–23 months (%) (n=8881) 74.3
Antipyretic use between 0–5 months (%) (n=10 745) 86.7
Eye ointment use between 0–5 months (%) (n=10 745) 44.9
  1. aStatistics are derived from subjects with non-missing data, for each characteristic.