Statistical analysis
Sample size was calculated based on a pilot study, with the distance walked in the MSWT for the SCAG being 598 ± 129 m and in the CG 900 ± 193 m. Based on power of 95% and alpha of 0.05, the effect size was 1.8, the number of subjects was 10 for each group. The 5STS-test showed an average time of 9 ± 2 seconds for SCAG and 8 ± 1 seconds for the CG in the pilot study. Based on power of 80% and alpha of 0.05, the effect size was 1.0 and the number of subjects was 41 for each group.
The normality of the studied variables was analyzed using the Shapiro Wilk test. Parametric data were represented by mean and standard deviation, and nonparametric data were expressed as median and interquartile range. For comparisons between groups, the unpaired student t test or the Mann-Whitney test was used depending on the normality of the data.
The intraclass correlation coefficient (ICC) and the Bland-Altman analysis were used to test the reproducibility of tests MSWT (distance walked) and 5STS-test (time to perform) test and retest, in the SCAG. The ICC was characterized as follows: low reliability <0.40; moderate reliability 0.40 - 0.75; strong reliability 0.75 - 0.90; excellent reliability <0.90.23,24Statistical significance was considered p <0.05. Data analysis was performed with the software SPSS version 22.