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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.