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TABLE 3

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

Description of Comparison Groups by StudyReadmitted to Hospitala
Required Hospital Careb
Adjusted OR (95% CI)
No.%No.%
All NICU survivors from 6 Kaiser Permanente hospitals, N = 6054 (Escobar et al66      
    <33 wk, all LOS 20 3.4 — — 1.88 (1.10–3.21) 
    33–36 wk, LOS < 96 h 31 5.7 — — 2.94 (1.87–4.62) 
    33–36 wk, LOS ≥ 96 h 26 2.2 — — 1.13 (0.69–1.84) 
    Term, LOS ≥ 96 h 32 2.8 — — 1.31 (0.83–2.05) 
    Term, LOS < 96 h 56 2.2 — — Reference 
One half of all births >34 wk born in UK northern region, N = 11406 (Oddie et al     
    35–37 wk 37 6.3 — — 1.72 (1.15–2.57) 
    >40 wk 57 2.4 — — 0.70 (0.51–0.95) 
    38–40 wk 178 3.4 — — Reference 
All newborns surviving to discharge at 7 Kaiser Permanente hospitals, N = 33 276 (Escobar et al     
    <34 wk (100% in NICU) 26 3.0 — — 0.96 (0.57–1.62) 
    34–36 wk, in NICU ≥ 24 h     0.89 (0.54–1.46) 
    34–36 wk, in NICU < 24 h     1.31 (0.41–4.21) 
    34–36 wk, never in NICU     3.10 (2.38–4.02) 
    All 34- to 36-wk infants 94 4.4 — —  
    ≥37 wk, in NICU ≥ 24 h     0.79 (0.52–1.21) 
    ≥37 wk, in NICU < 24 h     1.43 (0.73–2.81) 
    ≥37 wk, never in NICU     Reference 
    All ≥37-wk infants 618 2.0 — —  
All Massachusetts newborns discharged early after vaginal delivery, N = 25 324 (Tomashek et al     
    34–36 wk 35 3.5 — — 1.8 (1.3, 2.5)c 
    37–41 wk 489 2.0 — — Reference 
    34–36 wk — — 43 4.3 1.5 (1.1, 2.0)c 
    37–41 wk — — 648 2.7 Reference 
Description of Comparison Groups by StudyReadmitted to Hospitala
Required Hospital Careb
Adjusted OR (95% CI)
No.%No.%
All NICU survivors from 6 Kaiser Permanente hospitals, N = 6054 (Escobar et al66      
    <33 wk, all LOS 20 3.4 — — 1.88 (1.10–3.21) 
    33–36 wk, LOS < 96 h 31 5.7 — — 2.94 (1.87–4.62) 
    33–36 wk, LOS ≥ 96 h 26 2.2 — — 1.13 (0.69–1.84) 
    Term, LOS ≥ 96 h 32 2.8 — — 1.31 (0.83–2.05) 
    Term, LOS < 96 h 56 2.2 — — Reference 
One half of all births >34 wk born in UK northern region, N = 11406 (Oddie et al     
    35–37 wk 37 6.3 — — 1.72 (1.15–2.57) 
    >40 wk 57 2.4 — — 0.70 (0.51–0.95) 
    38–40 wk 178 3.4 — — Reference 
All newborns surviving to discharge at 7 Kaiser Permanente hospitals, N = 33 276 (Escobar et al     
    <34 wk (100% in NICU) 26 3.0 — — 0.96 (0.57–1.62) 
    34–36 wk, in NICU ≥ 24 h     0.89 (0.54–1.46) 
    34–36 wk, in NICU < 24 h     1.31 (0.41–4.21) 
    34–36 wk, never in NICU     3.10 (2.38–4.02) 
    All 34- to 36-wk infants 94 4.4 — —  
    ≥37 wk, in NICU ≥ 24 h     0.79 (0.52–1.21) 
    ≥37 wk, in NICU < 24 h     1.43 (0.73–2.81) 
    ≥37 wk, never in NICU     Reference 
    All ≥37-wk infants 618 2.0 — —  
All Massachusetts newborns discharged early after vaginal delivery, N = 25 324 (Tomashek et al     
    34–36 wk 35 3.5 — — 1.8 (1.3, 2.5)c 
    37–41 wk 489 2.0 — — Reference 
    34–36 wk — — 43 4.3 1.5 (1.1, 2.0)c 
    37–41 wk — — 648 2.7 Reference 

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 al and Tomashek et al).

b

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

c

Shown are relative risks with confidence limits.

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