Table 1 Background factors of 1-month-old infants and their mothers.

From: Administration of β-lactam antibiotics and delivery method correlate with intestinal abundances of Bifidobacteria and Bacteroides in early infancy, in Japan

Background factors

Data

Number of infants

130

Number of females

70 (54.0%)

Gestational age at birtha

275.1 ± 9.3

Birth weighta

3038.9 ± 339.7

Maternal antimicrobial use at delivery

74 (56.9%)

Caesarean section

31 (23.8%)

Premature rupture of membrane

22 (16.9%)

Group B Streptococcus-positive status

33 (25.4%)

Infants with older siblings

67 (51.5%)

Exclusive Breast feeding

80 (61.5%)

Age of Mothersa

31.6 ± 5.1

Maternal history of allergy

55 (42.3%)

Neonatal respiratory disorder

2 (1.5%)

Neonatal jaundice

4 (3.1%)

RSV infection

3 (2.3%)

Maternal history of smoking

9 (6.9%)

Maternal history of Hyperthyroidism

2 (1.5%)

Maternal history of Diabetes Mellitus

2 (1.5%)

  1. RSV respiratory syncytial virus.
  2. aGestational age at birth, birth weight, and maternal age are shown as the mean ± standard deviation. Other factors are given as the number of subjects and a percentage.
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