“…Despite the abundance of cross-sectional studies testing the main tenets of the Interpersonal Theory of Suicide, to date, only ten longitudinal studies have tested the synergy hypothesis (Batterham et al, 2018;Czyz et al, 2018;Hallensleben et al, 2019;Kleiman et al, 2014;Kyron et al, 2018;Miller et al, 2016;Roeder & Cole, 2018;Teismann et al, 2017;Wolford-Clevenger et al, 2019;Yang et al, 2020). The results of these studies were mixed, with four studies not finding a statistically significant interaction (Miller et al, 2016;Roeder & Cole, 2018;Teismann et al, 2017;Yang et al, 2020), and six studies finding a statistically significant interaction. Of the six studies that found a significant interaction, one indicated a pattern contrary to the synergy hypothesis (i.e., the relationship between thwarted belongingness and suicide ideation was weaker among those with high levels of perceived burdensomeness; Batterham et al, 2018), whereas five studies found an interaction with a pattern that was consistent with the synergy hypothesis (i.e., the relationship between thwarted belongingness and suicide ideation was stronger among those with high levels of perceived burdensomeness; Czyz et al, 2018;Hallensleben et al, 2019;Kleiman et al, 2014;Kyron et al, 2018;Wolford-Clevenger et al, 2019).…”