The independent risk factors for failure of non-invasive positive pressure ventilation were gender , gestational age , antepartum steroid at 24 h before birth to 7 d , and birth weight , with the OR ( 95 % confidence interval ) being 14.120 ( 1.135 , 175.662 ) , 2.862 ( 1.479 , 5.535 ) , 61.084 ( 3.115 , 1 198.031 ) , and 8.306 ( 1.488 , 46.383 ) , respectively .