Table 3.

Factors related to PH

^*no PH: continuous positive airway pressure support case (3 patients) excluded; no ventilator care (4), ^†no PH: continuous positive airway pressure support case (3 patients) excluded; missing data (12), PH: missing data (1), ^‡no PH: missing data (4), PH: death case (4 patients) exclueded, ^§no PH: missing data (4), ^∥no PH: missing data (2). PH: pulmonary hypertension, BPD: bronchopulmonary dysplasia, HFO: high-frequency oscillator ventilator, PEEP: positive end expiratory pressure, PDA: patent ductus arteriosus, OP: operation