“…Secondary outcomes varied between studies, including changes in dietary pattern and physical activity (Burke et al, 2011; Jakicic et al, 2016; Svetkey et al, 2015; J. G. Thomas et al, 2017; Turner-McGrievy et al, 2017), self-efficacy (Hales et al, 2016; Siriwoen et al, 2018), user engagement and interaction with apps (Brindal et al, 2013), BMI (Godino et al, 2016; Hales et al, 2016), waist circumference (Burke et al, 2011; Godino et al, 2016; He et al, 2017; Siriwoen et al, 2018; Toro-Ramos et al, 2017), blood pressure (Godino et al, 2016; Toro-Ramos et al, 2017), and behavioral adherence (Burke et al, 2011; Spring et al, 2017). Data collection periods lasted 24 months for three studies (Godino et al, 2016; Jakicic et al, 2016; Svetkey et al, 2015), 12 months for two studies (Spring et al, 2017; J.…”