“…Participant characteristics that have previously been linked to adherence include baseline symptom severity (Christensen et al, 2009; Melville et al, 2010), age (Buller et al, 2008; Christensen et al, 2009; Melville et al, 2010; Wangberg et al, 2008), gender (Christensen et al, 2009; El Alaoui et al, 2015b; Kelders et al, 2013; Melville et al, 2010; Wangberg et al, 2008), marital status (Christensen et al, 2009; Melville et al, 2010), level of education (Alfonsson et al, 2016; Melville et al, 2010; Wangberg et al, 2008), outcome expectancy (Crutzen et al, 2011; Geraghty et al, 2010), locus of control (Geraghty et al, 2010), intrinsic motivation (Alfonsson et al, 2017; Alfonsson et al, 2016), and amount of internet use (Kelders et al, 2013). We aim to investigate the impact of a variety of interventions and participants characteristics on multiple aspects of adherence within and across interventions.…”