“…Findings on gender differences for passive bystanding have been mixed; some studies has found passive bystanding to be more common among girls (e.g., Salmivalli & Voeten, 2004), while others has found passive bystanding to be more common among boys (e.g., Pozzoli & Gini, 2012). A few studies also suggest that defending is negatively related to the number of students in the classroom (Peets et al, 2015;; but see null result in Thornberg, Wänström, Hong, & Espelage, 2017), and that pro-aggression is positively related to the proportion of boys in the classroom (Pozzoli et al, 2012b;Thornberg, Wänström, & Jungert, 2018).…”