TABLE 1

Characteristics of Infants

OverallSIMVACV
N201010
Birth weight, median (range), g970 (596–1850)930 (600–1800)890 (630–1200)
Gestational age, median (range), wk27 (25–36)27 (26–36)27 (25–28)
Prenatal steroid treatment, n19910
Postnatal surfactant treatment, n1899
Baseline
    Peak inspiratory pressure, median (range), cm H2O16 (13–20)17 (14–18)16 (13–20)
    Mean airway pressure, median (range), cm H2O6 (5–9)7 (6–9)5 (5–6)
    Fraction of inspired oxygen, median (range)0.26 (0.21–0.35)0.23 (0.21–0.32)0.26 (0.21–0.35)
    Inflation time, median (range), s0.35 (0.34–0.40)0.35 (0.34–0.36)0.35 (0.35–0.40)
    Ventilator rate, median (range), breaths per min33 (25–45)33 (25–45)35 (35–40)a
    Infant respiratory rate, median (range), breaths per min51 (35–73)53 (35–73)50 (40–60)
  • a Back-up rate.