Table 1.

Descriptive Data for Infants at Boston and Babies' Hospitals, by Hospital, Case Status, and Mechanical Ventilation Treatment

HospitalCase StatusMechanically Ventilated
Boston
(n = 341)
Babies'
(n = 100)
P
Value
Cases
(n = 149)
Controls
(n = 292)
P
Value
Yes
(n = 288)
No
(n = 153)
P
Value
Maternal
Initiator of preterm delivery
 Preterm labor4237.844241.914436.28
 Preterm rupture of membranes293030282930
 Toxemia202119212022
MgSO4Rx4341.423845.094439.19
Antenatal glucocorticoid Rx6552.016362.456067.10
Cesarean section delivery6458.146661.176461.27
Medicaid insurance2246<.00011932.0022042<.0001
Infant
Birth weight, median (g)10301090.078401140<.00019511210<.0001
Birth weight z score, median−.52−.79.44−.35−.66.11−.32−1.00<.0001
Gestational age, wk
 <261814.023011<.0001245<.0001
 26–28433151354924
 >28395519552871
Sex male5249.375350.315248.24
Ethnicity
 White6428<.00016453.0066248.0003
 Black221421202118
 Latino7487211125
Singleton7681.167279.087678.33
T4in lowest quartile (<5.3 μg/dL)2621.204117<.00013211<.001
Early neonatal treatment
Surfactant4510<.00016523<.0001570<.0001
Indomethacin282<.00014511<.0001341<.0001
Sedation (morphine or fentanyl)460<.00016620<.0001551<.0001
Respiratory support, max, d 0–7
 None108<.0001014<.0001
 Supplemental oxygen only4014
 CPAP1163134
 IMV62267742
 HFOV133216
  • Rx indicates treatment; IMV, intermittent mechanical ventilation; HFOV, high-frequency oscillatory ventilation.

  • * Values are column percents unless specified.