“…For instance, Sani, Herrera, Wakefield, Boroch, and Gulyas (2012) found that family identification in a sample of Polish people (Study 1) and army unit identification in a group of soldiers (Study 2) both significantly predicted SWL, even after age, education level/army rank, and extent of contact with group members were controlled for. Similarly, in a large cross-cultural study involving Scottish and Italian participants, Wakefield et al (2017) found that higher identification with each of three separate groups (the family, the local community, and a third social group of the participant's choice) predicted higher SWL. Furthermore, the authors obtained an additive effect: a positive relationship between the number of these three groups with which participants identified and their SWL.…”