At W2 only, the Social Network Index (Cohen et al., 1997) was collected. This measure assessed recent involvement in 11 types of social relationships (e.g., relatives, friends, co-workers, neighbors) (intraclass correlation coefficient [ICC] = 0.70; Ruan et al., 2008). Our variable for SNI summed the types of social relationships that were active in the past two weeks (Cohen et al., 1997). In the W2 assessment only, the 12-item version of the interpersonal support evaluation list (ISEL-12) to measure ISS (α = 0.82) was collected (Cohen et al., 1985; Ruan et al., 2008), which has been extensively used in studies involving alcohol, health, and mental health populations (King, 2012; Moak and Agrawal, 2010; Swartz, 2005). The ISEL-12 evaluates respondents’ current perceived availability of interpersonal resources and includes three subscales of interpersonal belonging, appraisal, and perceptions of tangible interpersonal resources (e.g., “If I were sick, I know I would find someone to help me with my daily chores.”). ISS was modeled as a latent variable.
