... Life satisfaction was exclusively measured using the Satisfaction with Life Scale (Diener, Emmons, Larsen, & Griffin, 1985), the Students' Life Satisfaction Scale (Huebner, 1991), or the Brief Multidimensional Students' Life Satisfaction Scale (Seligson, Huebner, & Valois, 2003), all self-report questionnaires with five to seven items. In considering cross-sectional data, gratitude was found to be consistently positively related to life satisfaction with effect sizes primarily in the medium to large range regardless of whether gratitude was measured as a trait (Chan, 2012;Chen, 2013;Chen & Kee, 2008;Froh, Emmons et al., 2011;Froh, Fan et al., 2011;Hoy et al., 2013;Israel-Cohen et al., 2015;Poelker et al., 2017;Rey et al., 2018;Tam & Lai, 2017;Tam et al., 2018;You et al., 2018;Zeng, Ling, Huebner, He, & Lei, 2017), a character strength (Park & Peterson, 2006;Ruch, Weber, Park, & Peterson, 2014;van Eeden, Wissing, Dreyer, Park, & Peterson, 2008), a mood (Froh, Yurkewicz et al., 2009) or gratitude for life (Proctor et al., 2010). These correlational findings come from samples of children ranging in ages from 6 to 19 years from America, China, Guatemala, Israel, South Korea, South Africa, Spain, Switzerland, Taiwan, and the United Kingdom. ...