Sample-size and power calculation
COPD
COPD
The 276-person sample-size was based on an effect size of 0.3 odds ratio (OR), with 20% loss to follow-up and 80% power to detect superiority of referral to TelePR compared to SPR for the 6-month COPD readmission/mortality outcome using a two-sided chi-squared test at a significance level of 0.05 [