RESULTS	The median percentage of nights the machine was used was 95.5 % ( range , 45 to 100 % ) on constant CPAP , and 96.5 % ( range , 40 to 100 % ) on auto-CPAP ; the median apnea index recorded by the device was 0.40 / h ( range , 0 to 2.40 / h ) on constant CPAP , and 0.45 / h ( range , 0 to 5.80 / h ) on auto-CPAP ( differences not significant ) .\