NPPB and periventricular leukomalacia: Using ANOVA, we checked if there was a difference in NT-proBNP levels or myocardial work values between the no PVL, mild PVL and moderate PVL groups, and found that the NT-proBNP levels did indeed differ between the groups (p  = 0.033), while the myocardial work values were comparable (GWI p  = 0.221; GCW p  = 0.327; GWW p  = 0.202; GWE p  = 0.480).