TABLE 3

Late-Preterm Infants and Rates of Readmission to the Hospital After the Birth Hospitalization

Description of Comparison Groups by StudyReadmitted to HospitalaRequired Hospital CarebAdjusted OR (95% CI)
No.%No.%
All NICU survivors from 6 Kaiser Permanente hospitals, N = 6054 (Escobar et al66)
    <33 wk, all LOS203.41.88 (1.10–3.21)
    33–36 wk, LOS < 96 h315.72.94 (1.87–4.62)
    33–36 wk, LOS ≥ 96 h262.21.13 (0.69–1.84)
    Term, LOS ≥ 96 h322.81.31 (0.83–2.05)
    Term, LOS < 96 h562.2Reference
One half of all births >34 wk born in UK northern region, N = 11406 (Oddie et al4)
    35–37 wk376.31.72 (1.15–2.57)
    >40 wk572.40.70 (0.51–0.95)
    38–40 wk1783.4Reference
All newborns surviving to discharge at 7 Kaiser Permanente hospitals, N = 33 276 (Escobar et al3)
    <34 wk (100% in NICU)263.00.96 (0.57–1.62)
    34–36 wk, in NICU ≥ 24 h0.89 (0.54–1.46)
    34–36 wk, in NICU < 24 h1.31 (0.41–4.21)
    34–36 wk, never in NICU3.10 (2.38–4.02)
    All 34- to 36-wk infants944.4
    ≥37 wk, in NICU ≥ 24 h0.79 (0.52–1.21)
    ≥37 wk, in NICU < 24 h1.43 (0.73–2.81)
    ≥37 wk, never in NICUReference
    All ≥37-wk infants6182.0
All Massachusetts newborns discharged early after vaginal delivery, N = 25 324 (Tomashek et al8)
    34–36 wk353.51.8 (1.3, 2.5)c
    37–41 wk4892.0Reference
    34–36 wk434.31.5 (1.1, 2.0)c
    37–41 wk6482.7Reference
  • OR, odds ratio; CI, confidence interval; LOS, length of stay; UK, United Kingdom; —, data not reported.

  • a Readmitted to hospital within 2 weeks after birth hospitalization discharge (Escobar et al3,66) and within first 28 days of life (Oddie et al4 and Tomashek et al8).

  • b Required hospital care includes hospital inpatient readmission and observational stay visit during neonatal period.

  • c Shown are relative risks with confidence limits.