Table 1.
Baseline data (mean (SD) or n (%)) for randomised groups and the breast-fed reference group
| Bottle A | Bottle B | Breast-fed | |
|---|---|---|---|
| n = 31 | n = 32 | n = 74 | |
| Birth weight (g) | 3518 (441) | 3322 (381) | 3363 (407) |
| Gestational age (weeks) | 39.9 (1.4) | 39.4 (2.5) | 39.7 (1.2) |
| Boys n (%) | 18 (58) | 18 (56) | 39 (53) |
| Primips n (%) | 9 (29) | 12 (39) | 31 (43) |
| Vaginal delivery n (%) | 18 (58%) | 20 (65%) | 58 (81%) |
| Social code 1 or 2 n (%) | 7 (24%) | 5 (17%) | 52 (76%)* |
| Ethnic group of infant n (%) | |||
| White | 18 (55%) | 20 (66%) | 32 (45%) |
| Asian | 6 (19%) | 6 (20%) | 21 (29%) |
| Black | 2 (7%) | 3 (11%) | 8 (11%) |
| Mother's age (yrs) | 29.0 (6.5) | 27.8 (7.6) | 31.7 (4.8)* |
| % non-smokers | |||
| Mother | |||
| 1st trimester | 86% | 65% | 95%** |
| 2nd/3 rd trimester | 79% | 68% | 97%** |
| Current | 83% | 65% | 95%** |
| Father | 60% | 58% | 78%** |
* p < 0.05 breast-fed group compared to bottle-fed groups (ANOVA)
** p = 0.001 chi square for the proportion of non-smokers according to the different stages of gestation and feeding group; and for smoking/non-smoking in fathers.
Social code consists of 5 categories; 1 or 2 indicates that the breadwinner is in a professional or managerial position