2024

Lappalainen, Anna-Lotta; Keinonen, Katariina; Lappalainen, Päivi; Lappalainen, Raimo; Kaipainen, Kirsikka; Puolakanaho, Anne; Kiuru, Noona;

This study examined individual differences among adolescents (N = 154) in their initial well-being and in their response to a brief online Acceptance and Commitment Therapy intervention targeted at promoting life satisfaction. Cluster analysis identified three distinct subgroups of adolescents based on their life satisfaction, depressive symptoms and psychological flexibility at baseline: 1) Low well-being (16%), 2) Medium well-being (49%), and 3) High well-being (35%). Life satisfaction improved most during the intervention in the low initial well-being subgroup of adolescents. Between group effect sizes were large between Low and Medium (d = 0.85), and Low and High (d = 0.91) well-being groups.