Exact(8)
Statistical analysis was performed using JMP analysis of variance (ANOVA) to compare results between groups.
This prevents comparison of results between groups but allows for a larger number of treatments methods to be tested.
Jensen and Finley (1996) also issued pre- and post-course tests, but compared the results between groups of differing instruction methods.
The Wilcoxon signed-rank test was used to evaluate differences between preoperative and final follow-up values, while the Mann–Whitney U-test was used to compare results between groups.
A power analysis was not formally performed because the number of patients in this study (20 cases in each group) does not give enough power to differentiate the results between groups.
To compare demographics, clinical data, and LFT results between groups with and without weaning failure as defined above (NIV and/or mechanical cough assistance and/or reintubation, within 48 h after extubation), we used the Chi-square test for categorical variables and the Wilcoxon t test for quantitative co-variables.
Comparisons of electrophysiological properties and PCR results between groups were performed by Student's t-test.
Differences in neurocognitive test results between groups were assessed with either two sample t- test or Mann-Whitney U test as appropriate.
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