Central apnea hypopnea index:NRat:Stdy:^Patient:Qn
central apnea hypopnea index:nrat:stdy:^patient:qn
Central apnea hypopnea index:Number=Count/Time:Duration of the study:^Patient:Quantitative
central apnea hypopnea index:number=count/time:duration of the study:^patient:quantitative