“…Aiming to include important confounding variables outlined in the research literature, in addition to demographic variables, we used a combination of statistical significance (inclusion of predictors that reduced bias), prior research, and practical access to decide which covariates were included or excluded from the model (Sullivan & Field, 2013). Cases were matched on the amount of verbal and physical forms of bullying they witnessed (Verbal and Physical Bullying Scale; Kochenderfer & Ladd, 1996;Smith et al, 2012;Swearer, 2001;Wolke et al, 2000), attitudes about bullying (Swearer & Cary, 2003), gender, age (Forsberg, Thornberg, & Samuelsson, 2014;Nansel et al, 2001;Nishina & Juvonen, 2005;Obermann, 2011;Pöyhönen et al, 2010), and ethnicity (Juvonen, Graham, & Schuster, 2003).…”