2.3.5. Randomization
The randomization process for determining the starting order of each CPAP technology (conventional vs. CPAP-AirFlife™) was conducted using a simple randomization method. This method ensured that each patient had an equal probability of beginning with either option. To maintain the concealment of randomization, sequentially numbered envelopes that were non-transparent were used. An external epidemiologist generated the sequence of randomization. The healthy adult volunteers who participated in the trial were enrolled in the study and kept masked until the assignment of the starting order for each CPAP technology was determined. 