Original data of AOP

The cases in this study including total 120 premature patients (gestational age < 34 weeks) that were enrolled into the neonatal ward of the XXX Hospital during 01/01/2017 to 12/31/2017. The treatment were caffeine citrate load 20 mg / kg/day, maintenance10 mg /kg/day, administered once every 24 hours; and aminophylline loading 5 mg /kg/day, maintenance 5 mg /kg/day, once every 12 hours. Three ventilation methods were utilized in each group: invasive ventilator assisted ventilation, non-invasive ventilator assisted ventilation, and mask/nasal catheters.