**2.3 Statistical analysis**

The statistical data for this study were captured, analyzed, and compared using the Microsoft Excel 2010 software; and the Spss software, Version 23.0. Armonk, NY: IBM Corp.

A test-retest was performed for a sample of 10 patients that was randomly selected to see if the questions were well assimilated by the patients. The intra-class correlation coefficient (ICC) with a 4-week interval between the two measurements with alpha level of significance alpha = 5% (corresponds to a 95% confidence). P < 0.05 value was considered significant.
