TABLE 2

Unadjusted Clinical and Demographic Characteristics of Infants Readmitted Versus Not Readmitted (N = 268)

CharacteristicReadmitted (n = 67)Not Readmitted (n = 201)ORa95% CIaP
Mode of delivery, % (n)
 Cesarean25.4 (17)45.3 (91)0.380.20–0.72.003
 Vaginal74.6 (50)54.7 (110)Ref
Length of stay, d
 Mean ± SD3.7 ± 3.64.6 ± 4.80.6b0.38–0.98.04b
 Median (range)2.5 (1–20)3.0 (0.5–37)
Admission status, % (n)
 Newborn nursery64.2 (43)64.7 (130)0.970.50–1.90.93
 NICU/special care nursery38.8 (26)37.3 (75)1.090.56–2.15.79
Feeding method, % (n)
 Exclusive breastfeeding31.3 (21)27.4 (55)
 Exclusive bottle-feeding34.3 (23)48.8 (98)0.52c0.29–0.96.03c
 Both breastfeeding and bottle-feeding34.3 (23)23.9 (48)
Bilirubin screening before discharge74.6 (50)115 (57.2)2.441.25–4.73.009
Gender, % (n)
 Male59.7 (40)47.8 (96)1.650.93–2.92.09
 Female40.2 (27)52.2 (105)Ref
Birth weight, mean ± SD, g2703 ± 5592584 ± 4721.0011.00, 1.001.06
Singleton pregnancy, % (n)
 Singleton79.1 (53)84.1 (169)0.680.32–1.46.32
 Multiple20.9 (14)15.9 (32)Ref
Maternal age, mean ± SD, y28.2 ± 6.127.9 ± 6.3.70
Gravidity, mean ± SD2.36 ± 1.82.39 ± 1.40.990.82–1.19.90
Primiparous status37.3 (25)35.3 (71)1.090.61–1.96.80
Race, % (n)
 Non-Hispanic white82.0 (55)82.1 (165)1.0d0.46–2.17.42d
 Black12.0 (8)13.4 (27)
 Other4.5 (3)3.0 (6)
 Unknown1.5 (1)1.5 (3)
Ethnicity, % (n)
 Non-Hispanic91.0 (61)79.1 (159)1.620.47–5.58.44
 Hispanic7.5 (5)3.5 (7)Ref
 Unknown1.5 (1)17.4 (35)
Insurance type, % (n)
 Private insurance65.7 (44)61.2 (123)1.220.68–2.20.51
 Public insurance/self-pay34.3 (23)38.8 (78)Ref
  • —, not applicable.

  • a ORs and 95% CIs derived from simple conditional logistic regression, accounting for matching characteristics of gestational age, birth hospital, and month of birth.

  • b P value for comparison of log-transformed values.

  • c P value for comparison of any breastfeeding with exclusive bottle-feeding.

  • d P value for comparison of white versus non-white.