METHODS	We did a randomised parallel trial to compare change in blood pressure in 118 men with obstructive sleep apnoea ( Epworth score > 9 , and a > 4 % oxygen desaturation index of > 10 per h ) who were assigned to either therapeutic ( n = 59 ) or subtherapeutic ( 59 ) nCPAP ( about 1 cm H ( 2 ) O pressure ) for 1 month .\