The outcome variables for this study were wave 2 SRO and wave 2 current smoking. The main covariates were prior SRO and smoking status at wave 1. The individual SRO questions are: “During that time when (your mood was at its [sic] lowest/you enjoyed or cared the least about things), did you…feel like you wanted to die? think about committing suicide? attempt suicide?” Responses to these items were summed to create the total SRO question and measured as a dichotomous variable (none of the three = 0; any of the three = 1). Respondents who did not report low mood in wave 1 and were not asked the SRO questions were assigned a value of 0 for prior SRO.
