Table 1.

Information collected from identified apps.

Information type	Description
App name	Name of the app on the market
Description	Description of the app provided by the developers
Downloads	Download frequency; orders of magnitude: 500, 1000, 5000, 10,000, 50,000, 100,000, 500,000, 1,000,000, 5,000,000, 10,000,000, 50,000,000, and 100,000,000. For screening and selection, the logarithm to the base 10 of the download numbers was used because most download information was available only in orders of magnitude, as explained in the Methods (Screening and Selection section)
Rating	User rating. Mean rating (between 1 and 5; 1: lowest, 5: highest)
Title	Title of the app
Specific search terms	All keywords that categorize the app
Developer	Developer’s name
Rating count	Number of ratings the app has received from users. For screening and selection, the logarithm to the base 10 of the rating frequency was used
Language (default)	Languages that have been provided by the app
Market status	Whether the app has been published on the market
Website	The app’s website
Interactive Advertising Bureau category	Interactive Advertising Bureau categories are an industry-standard taxonomy for content categorization used by the database