All-cause mortality and cardiovascular mortality were significantly higher in the adaptive servo-ventilation group than in the control group ( hazard ratio for death from any cause , 1.28 ; 95 % CI , 1.06 to 1.55 ; P = 0.01 ; and hazard ratio for cardiovascular death , 1.34 ; 95 % CI , 1.09 to 1.65 ; P = 0.006 ) .