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Table 2 Characteristics of the mother-infant pairs included in the study.

From: Mechanics of sucking: comparison between bottle feeding and breastfeeding

Data Age Groups and Type of Feeding
  21-28 days 3-5 months
  Breastfeeding only
(n = 62)
Bottle feeding only
(n = 62)
Mixed feeding
(n = 110)
Mixed feeding
(n = 125)
Mother, age, years, mean ± SD 32.0 ± 4.8 31.9 ± 4.6 32.7 ± 5.4 32.5 ± 4.5
Type of pregnancy, n (%)     
   Single 62 (100) 54 (93.1) 80 (85.1) 104 (90.4)
   Twins 0 (0) 4 (6.9) 14 (14.9) 11 (9.6)§
Sex of the infant, no, (%)     
   Male 35 (56.5) 30 (49.2) 54 (49.5) 64 (51.2)
   Female 27 (43.5) 31 (50.8) 55 (50.5) 61 (48.8)
Gestational age, wk, mean ± SD 39.8 ± 1.2 39.4 ± 1.6 39.0 ± 1.3 39.4 ± 1.4
Birth weight, g, mean ± SD 3301.6 ± 349.2 3238.8 ± 501.9 3214.2 ± 429.8 3241.1 ± 451.4
Infant's age on the first feeding measure, days, mean ± SD 25.4 ± 2.1 24.5 ± 2.6 24.5 ± 3.6 120.8 ± 52.9
Feedings per day in the last week     
   Breastfeeding, mean ± SD NA NA 5.8 ± 1.9 4.4 ± 1.7
   Bottle feeding, mean ± SD NA NA 5.0 ± 2.2 3.7 ± 1.6
Time since the last feeding, h, mean ± SD 2.8 ± 0.7 3.2 ± 0.6 3.1 ± 0.6*
3.1 ± 0.7
3.5 ± 1.5*
3.4 ± 1.1
  1. Data missing in 2 newborns; §One twin did not enter the study.
  2. *Breast feedings; bottle feedings.