“…If lower, then lower students' results Socio-economic status (family income, employment) Mayston and Jesson (1988), Ray (1991), McCarty and Yaisawarng (1993), Chalos and Cherian (1995), Engert (1996), Chalos (1997), Duncombe et al (1997), Bretschneider (1998), Geshberg andSchuermann (2001), Muñiz (2002), Kiong et al (2005), Ouellette and Vierstraete (2005), Primont and Domazlicky (2006), Giménez et al (2007), Rassouli-Currier (2007), (2010), Millimet and Collier (2008), Alexander et al (2010), Carpenter and Noller (2010), Cherchye et al (2010), Houck et al (2010), Gronberg et al (2012), Thieme et al (2012), Deutsch et al (2013), Zoghbi et al (2013), Blackburn et al (2014), , Grosskopf et al (2014), Johnson and Ruggiero (2014).…”