RESULTS	Therapeutic nCPAP reduced mean arterial ambulatory blood pressure by 2.5 mm Hg ( SE 0.8 ) , whereas subtherapeutic nCPAP increased blood pressure by 0.8 mm Hg ( 0.7 ) ( difference -3.3 [ 95 % CI -5.3 to -1.3 ] ; p = 0.0013 , unpaired t test ) .\