Statistical analysis
hypoxemia, respiratory abnormalities
REGRESSION
Using propofol-based sedation, the hypoxemia rate during invasive endoscopic procedures under sedation was reported to range from 12 to 50%Continuous data were expressed as the mean and standard deviation. Categorical data were presented as numbers and percentages. Categorical variables were compared using Fisher’s exact test. Logistic regression analysis was used for univariate analysis, and the OR and 95% CI were calculated. The CI for the percentage of two values was calculated using the Clopper–Pearson interval. A two-tailed p-value < 0.05 was considered statistically significant. For comparison of multiple items, a p-value < 0.05/α (α indicating the number of multiplicities) was considered significant using the Bonferroni correction. When comparing respiratory abnormalities, a p-value < 0.0125 was set as the significance level because there were four variables. All data analyses were performed using SAS (version 9.4, SAS Institute, Cary, NC, USA).