Weekly product use reporting
During the enrollment visit (Visit 2), participants were registered into a short message service (SMS) system. Participants created a personal identification number (PIN) as part of their registration process and selected the time and day of the week when they wanted the SMS system to prompt them to enter their responses. Study staff trained participants on using the system, explained the meaning of abbreviations that would be utilized throughout the study duration, and how to delete their SMS history on their phones to protect their privacy. Participants completed a practice session with study staff before they left the clinic.During each of their four weeks of product use, participants received weekly messages regarding product use and acceptability on their selected days and times. Participants provided responses based on their most recent report, taking into consideration any potential weeks of missed reporting. Each SMS prompt would begin with a request for the participants’ PIN. Once the PIN was entered correctly, participants were asked to answer four questions: (1) Since your last report, how many times have you used the product? (Range 0–20); (2) Since your last report, how many times did you have RAI? (3) Of those [answer to Q2] times, how many times did you use the product before RAI? (Range 0 to [answer to Q1]; and (4) On a scale from 1–-10, how much did you like the product since your last report (1 = Extremely dislike; 10 = Extremely like). Questions were answered numerically, and responses had to be within feasible ranges. The SMS system was also programmed to accept skip patterns; for example, participants were not prompted to answer Questions 3 or 4 if they reported a 0 for Questions 1 and 2 (i.e., did not use the product and did not have RAI since their last SMS report).Prior to the PUEVs (Visits 3, 5, and 7), study staff reviewed alongside the participants the SMS data for that study period to ensure accuracy and correct any data that may have been incorrect (e.g., mistyped) or missing due to system (e.g., carrier outages) or user factors (e.g., forgot to complete an entry on a given week). Data that were outside the possible ranges (e.g., exceeding the maximum product dispensed) were corrected to reflect all products used.The data were then structured on weekly periods. If participants had received more than one message request in a week due to server errors or scheduled visit date changes (i.e., last-minute rescheduling of their PUEV at the clinic or modifications due to COVID-19), we aggregated their entries for that week so that their scores reflected the total sum of the first three questions and averaged their ratings for product acceptability in a given week.