“…(e.g., Brutsaert & Houtte, 2004;Harker, 2000;Pahlke, Hyde, & Mertz, 2013;Sullivan, 2009), where single-sex education is more longstanding, common, and pervasive. Studies that have been conducted in the U.S. have been, until very recently, largely confined to private school settings (e.g., Billger, 2009;Lee & Marks, 1990;LePore & Warren, 1997). Thus, much of the scholarship conducted to this point has focused on single-sex schools rather than single-sex classrooms within coeducational schools (Arms, 2007).…”