Table 3.
Distribution of domains discussed across studies by year
| Domain | Number of studies reported on each domain by year |
|||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | |
| Clarity of purpose of the app | 0 | 1 | 0 | 2 | 1 | 2 | 2 | 5 | 4 | 2 |
| Developer credibility | 0 | 1 | 0 | 3 | 1 | 6 | 1 | 3 | 6 | 3 |
| Content/information validity | 1 | 2 | 2 | 5 | 8 | 10 | 4 | 13 | 9 | 4 |
| User experience | 1 | 2 | 4 | 8 | 10 | 13 | 9 | 16 | 12 | 5 |
| User engagement/adherence and social support | 1 | 0 | 1 | 1 | 3 | 8 | 3 | 6 | 8 | 1 |
| Interoperability | 0 | 2 | 1 | 0 | 1 | 1 | 1 | 6 | 3 | 2 |
| Value | 0 | 1 | 1 | 3 | 3 | 5 | 5 | 6 | 5 | 2 |
| Technical features and support | 0 | 1 | 1 | 1 | 1 | 2 | 1 | 6 | 7 | 2 |
| Privacy/security/ethical/legal | 0 | 1 | 2 | 1 | 2 | 3 | 2 | 11 | 7 | 3 |
| Total identified studies | 1 | 3 | 4 | 10 | 11 | 16 | 10 | 20 | 16 | 6 |