Table 2.

Intervention characteristics of included studies (n=14).

Reference	Type of digital technology	Real-world setting
Robinson et al (2017) [40]	Hewlett-Packard iPAQ Personal Digital Assistant	Laboratory and home
Clarke et al (2016) [34]	Smartphone	Laboratory and home
Yang et al (2017) [39]	Smartphone	Home
Fleming and Burns (2017) [42]	Functioned only on desktop or laptop personal computers	Web-based
van Deursen et al (2015) [45]	Personal computer or laptop	Web-based
de Voogd et al (2016) [20]	Computer	Web-based at school and home
Enock et al (2014) [21]	Smartphone	Web-based
Monk et al (2017) [44]	Computer, mobile prohibited	Web-based
Wiers et al (2015) [26]	Computer	Web-based
Boendermaker et al (2016) [25]	Computer	Laboratory and home
Crane et al (2016) [46]	Smartphone app	Web-based
Elfeddali et al (2016) [35]	Computer	Web-based
Franklin et al (2016) [41]	Mobile app but can be used on phones, tablets, laptops, and desktops	Web-based
McNulty et al (2017) [43]	Computer	Laboratory and home