“…Social groups can vary greatly and groups may or may not remain intact over multiple nights, thereby potentially changing the likelihood of an individual experiencing a specific vulnerability on any given night. Basic indicators of group composition, such as demographics, can influence potential risk in clubs (e.g., male gender (Benson, 2002; Krienert & Vandiver, 2009; Testa, Kearns-Bodkin, & Livingston, 2009; Wells et al, 2009; Wells, Neighbors, Tremblay, & Graham, 2011), younger age (Miller et al, 2015), and larger group size (Cullum, O’Grady, Armeli, & Tennen, 2012b; McClatchley, Shorter, & Chalmers, 2014)).…”