“…Details of individual studies are reported in Table 1. Fourteen quantitative or mixed methods studies evaluated the impact of volunteering (Baker et al., 2017; Caspar et al., 2019; Clarkson et al., 2007; Di Bona et al., 2019; Lee et al., 2007; Lokon et al., 2017; Low et al., 2015; McNair & Moore, 2010; Sauer et al., 2016; Seitz et al., 2016; Skropeta et al., 2014; van Zon et al., 2016; Westerhof et al., 2018; Xaverius & Mathews, 2004), and 22 reported questionnaire or qualitative data (Biggs & Knox, 2014; Bradley et al., 2000; Damianakis & Wagner, 2007; Filinson, 2003; Gundersen & Johannessen, 2018; Hill, 2016; Hunter et al., 2018; Jain et al., 2020; Kawamura et al., 2009; Keith, 2001; Keith & Schafer, 2002; Landau et al., 2013; Lokon et al., 2012; Ostwald et al., 2003; Persson, 2004; Santini et al., 2018; Schwalbach & Kiernan, 2002; Somers, 2018; Tanner & Brett, 2014; Tinker et al., 2017; Van der Ploeg et al., 2012, 2014). Overall the quality of studies is poor.…”