Author: Lai, Veronica Ka Wai; Lee, Anna; Leung, Patricia; Chiu, Chun Hung; Ho, Ka Man; Gomersall, Charles David; Underwood, Malcolm John; Joynt, Gavin Matthew
Title: Patient and family satisfaction levels in the intensive care unit after elective cardiac surgery: study protocol for a randomised controlled trial of a preoperative patient education intervention Document date: 2016_6_22
ID: txfrcrub_11
Snippet: A sample size of 45 in each group will have 80% power to detect a difference in means of 10 points (the difference between mean control group satisfaction of 70 and a mean intervention group satisfaction of 80) assuming that the common SD is 16.6 (effect size of 0.60) using a two-group t-test with a 0.05 two-sided significance level. 6 We considered this moderate effect size as clinically important. Given that our fast-track failure rate in cardi.....
Document: A sample size of 45 in each group will have 80% power to detect a difference in means of 10 points (the difference between mean control group satisfaction of 70 and a mean intervention group satisfaction of 80) assuming that the common SD is 16.6 (effect size of 0.60) using a two-group t-test with a 0.05 two-sided significance level. 6 We considered this moderate effect size as clinically important. Given that our fast-track failure rate in cardiac surgery is ∼10%, we will recruit 100 patients for the study (50 patients in each group). A study of 100 is adequately powered to detect a decrease in anxiety (unadjusted mean difference of 2.7) score at day 7 after cardiac surgery (using the Chinese-Cantonese version of HADS 30 ) that was associated with a preoperative education intervention. 18 The sample size calculations were performed using nQuery Advisor V.7.0 (Statistical Solutions, Cork, Ireland).
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