Table 1.
Baseline characteristics of the INCA cohort subset included in this study
| N | AB-
|
AB+
|
AB2
|
AB7
|
| 126 | 56 | 20 | 36 | |
| GA, weeks (IQR)* | 39.4 (38.5, 40.4) |
40.4 (39.4, 41.1) |
40.05 (39.3, 41.0) |
40.55 (40.1, 41.2) |
| Birth weight, mean grams (SD) * | 3478 (515) | 3711 (484) | 3734 (428) | 3699 (518) |
| Birth weight for GA z-score (SD) | 0.15 (1.2%) | 0.39 (1%) | 0.30 (1%) | 0.57 (0.9%) |
| Sex (Female %) | 58 (46%) | 28 (50%) | 13 (65%) | 15 (42%) |
| Delivery mode (Vaginal %) | 83 (66%) | 41 (73%) | 15 (75%) | 26 (72%) |
| Exclusive breast feeding at 3 m (Yes %) | 47 (37%) | 23 (41%) | 17 (47%) | 6 (30%) |
| Additional AB 1–6 m (Yes %)*,** | 10 (8.2%) | 13 (24%) | 1 (5%) | 12 (34%) |
| Additional AB 7–12 m (Yes %) | 30 (27%) | 9 (19%) | 2 (10%) | 7 (24%) |
Statistically significant differences are indicated with *p<0.05 compared with AB-, **p<0.05 compared with AB2.
AB+, infants who received AB during their first week of life. Birth weight for GA z-score is calculated according to the z-score formula.77 AB2: AB exposure for 2 to 3 days in the first week of life, AB7: AB exposure for 7 days.
AB, antibiotics; AB-, control infants; GA, gestational age; m, months.