2.6.1. Quantitative Feasibility Measures
NPS
RECRUITMENT
The primary outcome of this study was feasibility, which was defined by the criteria listed below.Recruitment rate: the percentage of the eligible study population who agree to participate.Retention rate: the percentage of enrolled participants who completed the post-intervention evaluation.Adherence of the intervention participants: (1) number of planned nutrition consultations completed and average duration of the consultations; (2) register rate—participants registered on the iNutrition applet and participants were allocated to the intervention group × 100%; (3) number of logins into iNutrition applet from baseline to post-test; (4) the percentage of days that participants were active on the iNutrition applet during the 12-week intervention period; (5) percentage of registered participants who visited each module of the iNutrition applet. Adherence was recorded through the analytics function of the iNutrition applet, and records of attended nutrition consultations were kept.Acceptability of the participants of the intervention arm: this was determined through the System Usability Scale (SUS) and the Net Promoter Score (NPS) findings. The SUS is a valid and reliable 10-item usability measurement scale designed to evaluate software products, such as websites and applets, and was graded on a 5-point Likert scale [