“…These confounders could be categorized into three groups: 1) physical health, health complaints and health service use variables; 2) broader well-being and general burdens features; and, 3) lifestyle characteristics and health behaviours variables. Due to the fact that significant differences between male and female university students have consistently been described, such potential confounders include alcohol and other drug use (El Ansari, Sebena, & Stock, 2013;El Ansari, Stock, & Mills, 2013;El Ansari, Vallentin-Holbech, & Stock, 2014), physical in/activity (El Ansari, Stock & UK Student Health Group 2011;Piko, 2000), burdens and stress (El Ansari, Oskrochi, & Haghgoo, 2014), as well as psychosomatic symptoms and health complaints, health awareness, health service use, and social support (El Ansari et al, 2011).…”