At the same time, relatively few people took the extra step of doing some of the tasks that the app asked them to do. Just shy of 5,000 people completed a six-minute walk test, a common proxy of heart health, with their phones in hand, according to the study. And while 40,000 people filled out some portion of the app’s health questionnaires, only about 1,300 provided all the information needed to calculate their personalized health risks.
That squares with a recent study that showed that for the first five ResearchKit apps that launched, including MyHeart Counts, the percentage of daily users quickly dropped to 25% or below within the first three months.
“This is a very significant problem with this new form of medical research,” Topol said. “You accrue lots of people, but to keep them engaged, long-term, is perhaps the greatest challenge.” Apps could keep people coming back, he suggested, by offering participants something valuable in return, like personalized insights about their health.