Table 2.

Barriers and facilitators identified during the think-aloud and postprocedure interview.

Domain or survey type	Theme	Sample quotes
General structure, satisfaction	Information about security of app Use to raise awareness of health Everyone could learn from it	“The more I do, the easier it gets” “I just think it’s gonna help me monitor my health and go from there. I like technology that helps me and doesn’t just amuse me or keep going and if this helps me stay healthy, stay fit, it makes sense.”
Ease of use	Easy, simple, fun Questions easy to answer Confusion related to not paying attention and not reading the app instructions carefully enough Font color yellow difficult to see Font could be bigger	“The app spells everything perfectly clear after you read it a couple times to get it” “I wasn’t really paying attention to what I was reading. That was mostly my problem.”
Navigation	Navigating within and between surveys was easy More detail on getting back to the home screen and using “next,” “cancel,” and “done”	“The more I did it, the more I was able to figure out how to get from one place to another.” “You might want to give a little more detail about some of the sections, like what happens when you cancel, what happens when you hit done.”
Multiple-choice survey formats	Surveys were interesting and simple except physical activity survey with lengthy definitions and confusing response choices	“It was easy the questions were simple and it was easy to find the answers.”
Pictorial format	Body pain map did not include all areas that can be a real problem Checkbox worked differently than response choices for other surveys Hard to find the “no pain” box—small font	“Well, on the pain thing, I think they should have something near the anus. Because that can be a real headache. And then, of course, for women, it would also include, uh, the uterus.”
Cognitive tasks: Trail Making Test and Stroop	Stroop was confusing Difficulty understanding practice session versus testing session Confusion over 4 increasingly challenging sets of tests within the Stroop task TMTa had difficulties with instructions and navigation but the eFHS sample did not	“The all underling thing was a little confusing to me. I think because I was trying to get through it quick. I lost track of whether underline the word or is it the color or is it this color or the word?” “The trail-making one I liked”
Friends or family	Fear of technology; Little interest in learning how to use technology Learning curve for older people	“I think they would find it very useful I think it’s very useful, just for like, the cognitive part of it.”
Different cultural backgrounds	Need the app to be available in different languages	“I come from the Indian community, and we place a lot of value on education, you know, I think this is the kind of thing that, you know—I would—we do—I would like to be quizzed, and this is a quiz.” “For example, I came from Burma. Burma used to be very underdeveloped country, and, also, still lots of problem. But they are very good at technology.”

^aTMT: Trail Making Test.