Study selection
The
inclusion
criteria were (a) randomized controlled trials (RCTs), cohort studies,
or case-control studies; (b) inclusion of an NIV-NAVA group and a
conventional NIV group; (c) study subjects were preterm neonates born at
< 37 weeks; (d) the study included infants with respiratory
failure of various etiologies who underwent invasive mechanical
ventilation > 24 hours after birth; and (e) only compared
outcomes of initial elective extubation. Exclusion criteria were (a)
case reports, editorials, review articles, letters, and animal
experiments; (b) low quality articles with severe experimental design
flaws or unclear raw data; and (c) studies that were not original.