Researchers from the University at Buffalo (UB) in the US found that participants not only found the app easy and convenient to use - they were also willing to provide honest responses about substance use.
"Reporting was actually high - we had 95 per cent compliance with daily report completion. A key finding of our study was the ability for people living with HIV to feel comfortable reporting on sensitive health behaviors," said Sarahmona Przybyla, assistant professor at UB's School of Public Health and Health Professions.
The findings were more surprising considering that the majority of the 26 study participants had never used a smartphone before. After some initial smartphone training from research staff, they completed their reports with ease.
Participants were asked to use the app - named Daily Reports of Using Medications (DRUM) - to complete their reports, which took three to five minutes, between 4 pm and 6 pm each day for two weeks.
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Researchers were deliberate in their wording of the questions.
"People living with HIV continue to be a stigmatised population, so we didn't want any of the questions we developed to draw attention to their disease," said Przybyla.
"We never used 'HIV' or 'ART' - anything that would inadvertently out someone as having HIV," said Przybyla.
A change in daily routine was the most commonly reported reason participants did not take their medication, followed by simply forgetting. Use of alcohol or drugs was the third most common reason.
In the future, the app could aid in users' decision to use alcohol since some participants in this study reported that it helped them understand exactly how much they were drinking.
"I think the surprising thing is how much the app and the text reminders helped the participants to develop a routine," said Rebecca Eliseo-Arras, senior research analyst at UB's Research Institute on Addictions.
The research was published in the journal AIDS Research and Treatment.