Significant reductions were seen in pneumothorax ( @ of @ intervention group infants -LSB- @ % -RSB- vs @ of @ @ % -RSB- ; P = @ ) and severe intraventricular hemorrhage ( @ infants -LSB- @ % -RSB- vs @ -LSB- @ % -RSB- ; P = @ ) , and the combined survival without severe adverse events was increased in the intervention group ( @ infants -LSB- @ % -RSB- vs @ -LSB- @ % -RSB- ; P = @ ; absolute risk reduction , @ ; @ % CI , @ to @ ) .