Figure 2: Training Protocol Statistics Given the small sample size and skewed distribution, measured values were presented as median [interquartile range]. Individual percentages of absolute deviation from the goal length were calculated. Both rope and bowel measurements were repeated three times at each time point. The mean absolute deviation of these three measurements was used for analyses. The rope measurements were compared using the Friedman test. Wilcoxon Signed Rank test was used to conduct a paired difference test of the repeated bowel measurements and results are reported as P-value and Z-statistics. To analyse the effect of the training experiment, a separate analysis was performed for the participants with sufficient practice. Participants who did not meet our minimum criteria of practice (one time a week for at least 15 minutes) were excluded from this analysis. Acceptable variation in small bowel length measurement was defined as between the lower and upper margin of 10% deviation from the actual bowel length. A two-sided P-value of ≤ 0.05 was considered statistically significant. Statistical analyses were performed in SPSS version 24. 7 137 Measuring small bowel length in metabolic bariatric surgery: a training experiment
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