Data extracted from each included study
| Category | Item | Description |
| Publication timeline | Earliest search date | The earliest date authors report searching the app stores. |
| Latest search date | If app store searches were conducted over a period of time, the latest date authors report searching the app stores. | |
| Updated search date | If subsequent app store searches were performed, for example to update the initial search results, the latest date authors report conducting the updated search. | |
| Submission date | Date of manuscript submission to journal. | |
| Publication date | Earliest identified date at which the accepted, peer-reviewed manuscript is made available to the public—which may be an online-first/electronic preprint. Preprints prior to manuscript acceptance were not considered. | |
| Dates imputed | A Boolean variable coded as: FALSE if both the search date and publication date were specified precisely, or TRUE if either date was imputed. Imputation was based on the midpoint of the specified date range, for example if a search month is specified rather than a search date, then the 15th day of the month was the imputed search date. | |
| Review parameters | Number of apps reviewed | Number of apps reported for analysis, after any screening or filtering for relevance. |
| Apps downloaded | Ordinal variable coded as ‘no apps downloaded’ (eg, analysis was based on only app store metadata), ‘some apps downloaded’ (eg, a targeted or random sample), or ‘all apps downloaded’. | |
| Apps recommended | A Boolean variable coded as: TRUE if individual apps were named and described in a manner which suggests or recommends their use, or FALSE otherwise. |