TABLE 2

Annual Proportional and Absolute Changes in Adjusted Rates of Survival Without Major Morbidity and Its Components (2008–2017)

OutcomeStarting Rate (2008)aCurrent Rate (2017)aChange in IQR (2008–2017)bAbsolute Change, %Percent Change, %Average Change per y, %cChange per y, P
Survival without major morbidity62.266.9−1.84d4.77.60.7<.001
Infant death9.88.3−2.03d−1.5−15.7−0.2.01
Chronic lung disease20.620.63.04d0.020.1−0.07.44
Cystic PVL2.82.5−2.31d−0.3−11.3−0.02.46
Severe peri-intraventricular hemorrhage9.47.5−2.07d−1.9−20.4−0.3.002
Severe ROP or ROP surgery10.36.6−6.14d−3.8−36.4−0.5<.001
NI15.48.5−8.54d−6.9−44.7−0.8<.001
NEC5.93.2−5.64d−2.7−45.6−0.3<.001
  • a Per 100 infants.

  • b Change in IQR across all hospitals.

  • c Slope for regressing each outcome rate on birth year.

  • d Denotes statistical significance.