“…Research has suggested that in the evaluation of preventive interventions, especially those targeting low-income children, it is important to account for the potential pre-intervention confounding variables of child, family, and school demographic characteristics (e.g., Aber et al, 2011; Currie & Thomas, 1995; Hill, Waldfogel, & Brooks-Gunn, 2002; Jones et al, 2011; Love, Chazan-Cohen, Raikes, & Brooks-Gunn, 2013; Magnuson et al, 2007; Raver et al, 2009). These variables, as detailed below, have been taken into account in previous SEL studies as well to address the heterogeneity of students that may distort the relationships between SEL and child outcome measures (CASEL, 2012; Durlak et al, 2011; Jones & Bouffard, 2012; Merrell et al, 2008; Park-Higgerson et al, 2008; SACD Research Consortium, 2010; Wilson et al, 2001).…”