Statistical analysis
OSA
Sample size was calculated based on a 1:1 ratio of CPAP- and usual-care groups, assuming the BP lowering-effect of CPAP in the general population with OSA was 2.5 mmHg (from meta-analysis data) [Data were described using mean and SD or median and interquartile range (IQR) as appropriate for continuous variables, and percentage for categorical variables. Baseline characteristics were compared between treatment groups using t-test and χ