Table 1 Demographics of the infant cohorts at birth, 6Â weeks and 2Â years of chronological age
From: Development of the gut microbiota during early life in premature and term infants
| Â | Term | Premature |
|---|---|---|
Birth demographics | Â | Â |
 Female | 19 (51.4) | 14 (37.8) |
 Median birth weight (gram) | 3510 (3130, 3690) | 960 (765, 1325) |
 Mean gestation at birth (weeks + days) | 40 + 2 (39 + 4 to 41 + 2) | 28 + 1 (25 + 4 to 29 + 6) |
 Ethnicity |  |  |
  Black | 2 (5.4) | 4 (10.8) |
  White | 20 (54.1) | 18 (48.4) |
  Asian | 4 (10.8) | 9 (24.3) |
  Mixed race | 6 (16.2) | 3 (8.1) |
  Other | 5 (13.5) | 3 (8.1) |
 Mode of delivery |  |  |
  Caesarean section | 8 (21.6) | 8 (21.6) |
  Vaginal | 29 (78.4) | 29 (78.4) |
Six week demographics | Â | Â |
 Feeding at time of sampling |  |  |
  Breast milk | 26 (70.3) | 26 (70.3) |
  Formula | 10 (27.0) | 10 (27.0) |
  Mixed | 1 (2.7) | 1 (2.7) |
 Number of complete months of breast milk feeds | 1 (1, 1) | 1 (0, 1) |
 Number of courses of antibiotics | 0 (0, 0) | 1 (1, 2) |
Two year demographics | Â | Â |
 Infant age at sampling (months) | 24 (23.9, 24.2) | 35.7 (31.1, 39.1) |
 Feeding at time of sample |  |  |
  Weaned | 37 (37, 37) | 37 (37, 37) |
 Number of complete months of breast milk feeds | 11 (7, 17) | 6 (3, 9) |
 Age that the infant received non-breast milk feeds (months) | 0 (0, 4) | 3 (0, 6) |
 Number of courses of antibiotics since 6 weeks of age | 1 (0, 2) | 3 (0, 4) |
 Antibiotics use in the last month (yes) | 2 (5.4) | 2 (5.4) |
 Pet in the household (yes) | 7 (18.9) | 10 (27.0) |
 Other child in the household (yes) | 15 (40.5) | 21 (56.8) |
 Smoker in the household (yes) | 5 (13.5) | 2 (5.4) |
 Child suffered from one or more wheezing episodes (yes, parent reported) | 18 (48.6) | 13 (35.1) |
 Child suffers from eczema (yes, parent reported) | 24 (64.9) | 7 (18.9) |