2.2. Statistical Analyses
SECONDARY
Data analyses for primary, secondary, and usability outcome measures were completed using SPSS (ver. 25, IBM, SPSS Inc., Chicago, IL, USA). Normality tests were administered prior to completing comparison statistics. The appropriate parametric (independent Qualitative Usability Evaluation. The video recordings in the initial scenario-based usability test were coded by a research assistant who was not part of usability testing to minimize bias. An investigator who was present at the testing reviewed 20% of the coding to confirm its accuracy. The participant’s app interaction in this test was broken down into nine steps, which include the following: (1) open the app; (2) open the first VFE exercise; (3) play the exercise video; (4) stop the exercise video; (5) start recoding; (6) stop recording; (7) review the recorded video; (8) complete the first VFE exercise for the second time; and (9) open the second VFE exercise. These nine steps are necessary user interactions or experiences with the app in order to complete the scenario described earlier. If a participant completed all nine steps successfully, the testing completion rate was considered as 100%. The descriptive statistics of the testing completion rate were reported. Each user’s unique comments recorded during the ‘think aloud’ process were coded for each participant. These comments/statements were representative of the user’s interactions with the app. For example, if a user commented that this app was easy to use more than once, we only coded this user comment as “app easy to use” once for this participant. A summary of the comments made by the participants during the scenario testing and the post-study focus group were used for analysis.