The difference in weight loss fell short of significance (intervention group −3.7 kg, SD = 5.2 vs control group −1.9 kg, SD = 6.7; F(1,108) = 2.3, p = 0.13), although when adjusted for co-interventions (i.e., medical treatment) and incident morbidities that might affect weight, the difference was significant (M Difference 2.9 kg, 95% CI: −5.1 to −0.6, p = 0.014).
Changes in the perceived importance of a healthy diet and social support were not significant, but effect sizes suggested a numerical trend towards an advantage over the control group at four months (M difference importance = 0.1, p = 0.3, d = 0.3; M difference social support = 0.3, p = 0.08, d = 0.4).
Similarly, although social support was not significantly improved by the intervention, there was a meaningful size of effect that was close to significance in the expected direction (d = 0.4).