Statistical analysis
EEP
REGRESSION
The data were analyzed using SPSS Version 25.0 (IBM Corp., Armonk, NY,USA). Data conforming to a normal distribution with as confirmed by the Shapiro–Wilk test are expressed as mean ± standard deviation. Data not conforming to a normal distribution are expressed as median and interquartile range. The Wilcoxon signed rank test was used to compare the EEP, EIP, and comfort level of different nasal catheters and devices, and the Mann Whitney U test was used to compare the differences in pressure between sexes. Differences in actual output flow rates were evaluated using paired t-tests. Multiple linear regression was used to determine predictors of EEP. The regression models were visually assessed using residual histograms and residual versus predicted plots. A 