Anthropometry by enrolment site
| Mbekweni (African black ethnicity), N=329 | Newman (mixed ethnicity), N=346 | Total (N=675) | p Value* | |
|---|---|---|---|---|
| Median (IQR) | Median (IQR) | Median (IQR) | ||
| Age, days | 50 (46 to 57) | 52 (47 to 59) | 51 (46 to 58) | 0.1 |
| Weight, kg | 4.9 (4.4 to 5.5) | 4.7 (4.2 to 5.3) | 4.9 (4.3 to 5.4) | 0.004 |
| Weight for age z score | −0.2 (−0.8 to 0.6) | −0.6 (−1.4 to 0.1) | −0.4 (−1.2 to 0.4) | <0.001 |
| Length, cm | 56 (53 to 57) | 55 (53 to 57) | 55 (53 to 57) | 0.08 |
| Height for age z score | −0.7 (−1.7 to 0.3) | −1.0 (−2.0 to 0.0) | −0.8 (−1.8 to 0.1) | 0.003 |
| Weight for height z score | 0.7 (−0.1 to 1.6) | 0.5 (−0.3 to 1.3) | 0.6 (−0.2 to 1.4) | 0.010 |
| Birth weight, kg | 3.1 (2.8 to 3.4) | 3.0 (2.6 to 3.4) | 3.0 (2.7 to 3.4) | 0.02 |
| Z score birth weight | −0.4 (−1.3 to 0.3) | −0.8 (−1.5 to −0.1) | −0.6 (−1.4 to 0.1) | <0.001 |
| Gestation weeks | 39 (38 to 40) | 39 (38 to 40) | 39 (38 to 40) | 0.7 |
| Late preterm, 32–37 weeks, n (%) | 46 (14.0) | 40 (11.6) | 86 (12.8) | 0.345 |
*Kruskal-Wallis or Pearson χ2 tests comparing sites, Z scores calculated using the WHO Child Growth Standards26 and updated Fenton newborn growth charts.27