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Table 1 Baseline data (mean (SD) or n (%)) for randomised groups and the breast-fed reference group

From: Infant feeding bottle design, growth and behaviour: results from a randomised trial

  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%**
  1. * p < 0.05 breast-fed group compared to bottle-fed groups (ANOVA)
  2. ** 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.
  3. Social code consists of 5 categories; 1 or 2 indicates that the breadwinner is in a professional or managerial position