Aim and Objectives. This study aimed to conduct a new analysis of data from a previously published system- atic review of health promotion interventions for low-income groups (Bull et al., 2014), applying behavioral science frameworks and new statistical methods to understand more about their effectiveness. While the previous paper found interventions to have small, positive effects, the current paper investigates which critical features of intervention con- tent and delivery may contribute to their effectiveness. The association between a range of intervention components, individually and in combination, with variability in intervention effect sizes was examined. There were two specific objectives:
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