Research shows girls benefit from single-sex environments
In a learning environment that is free from gender discrimination, girls achieve greater academic success and are more confident.
• Dustmann, Ku and Kwak (2017, p. 28) found that the “the net effect of having single-sex peers for three years is strongly positive for girls”. When classes were converted from 100% female to 50% female, girls’ achievement in languages (Korean and English) fell by 8-15% of a standard deviation (pp. 4, 27). (Also see, Dustmann et al., 2017, Why single-sex schools are more successful.)
• A 2017 study of Year 3, 5 and 7 numeracy and literacy (NAPLAN) data by Dr Katherine Dix of the Australian Council for Educational Research (ACER) found that even when socio-economic status was taken into account, Year 7 girls at single-sex schools were 4.2 terms ahead of co-ed students in reading and 2.8 terms ahead in mathematics (Dix, 2017).
• In 2014, Professor Alison Booth of the Australian National University wrote in the Sydney Morning Herald that “the evidence is gathering that women in single-gender classes benefit, and they benefit significantly”. In fact, just one hour a week of single-sex education benefits girls (Booth, 2014). Booth et al.’s 2013 study found that female students at Essex University who were randomly assigned to all-female classes in their first year were 7% more likely to pass their introductory economics course than girls in co-ed classes. They also scored 8% higher on their final grade and 10% higher in their required second-year courses, despite only attending single-sex classes in their first year (Booth, Cardona-Sosa & Nolen, 2013, p. 3).
• An Australian study has found that girls gain confidence in Information Technology (IT) in single-sex classes. The four-year study, which ran in seven co-ed and three girls-only schools, found that 45% of girls made an unprompted positive comment about their experiences in single-sex IT classes. Feedback from the girls included that girls-only classes were more conducive to learning because boys disrupt classes; they were more willing to ask for help without boys being present; they were more confident and not afraid to try things out; and that in co-ed classes, boys put them down when they were trying to do something or express an idea (Fisher, Lang & Forgasz, 2015).
• In 2015, Andrew Hill of the University of South California found that opposite gender friends have a negative impact on the academic achievement of students at co-ed schools. Students aged 16 and over with higher numbers of opposite gender friends had lower grades across all subjects (p. 148); were less likely to graduate from high school or attend college (p. 173); had more difficulties getting along with their teachers (p. 148); and were more likely to be in a romantic relationship, which “may reduce both the quality and quantity of homework and studying”, as well as being “distracting in the classroom” (p. 171). Hill also found that in students aged under 16, grades in mathematics and science were negatively impacted by the effect of opposite gender friends, and that girls may benefit from single-sex classes in these subjects (p. 168).
• A 2015 study by Eisenkopft et al. identified a “very robust” positive effect on mathematics proficiency for girls randomly assigned to single-sex classes in a Swiss high school (p. 137). The effect was greater for students with high ability in maths and in classes taught by a male teacher, but “the effect also holds for less talented students and for classes taught by a female teacher”. Girls in single-sex classes also “evaluate their mathematics skills more positively and are more likely to attribute their performance in mathematics to their own efforts rather than to exogenous talent or luck” (p. 125).
• A SchoolDash analysis of GCSE results for 2015 found that 75% of girls attending England’s 271 government girls’ secondary schools achieved five good GCSEs compared with 55% of girls attending government co-ed schools, even after adjusting for socioeconomic background and selective intake. SchoolDash founder Timo Hannay wrote that these results are consistent with previous research, including a 2009 study of the Key Stage 2 and GCSE results of 700,000 girls by the Good Schools Guide which found that girls in all-girl comprehensive schools achieved better results than those who attended co-educational secondary schools, and a 2007 government-backed review which recommended that girls and boys should be taught separately to avoid girls being pushed aside in mixed-sex classrooms (Hannay, 2016; also see, Paton & Moore, 2009).
• Park, Behrman and Choi’s 2012 study of South Korean students — who were randomly assigned to single-sex and co-ed high schools until 2009 — found that “high school female seniors who attend all-girls schools show significantly higher mean scores than their peers who attend coeducational schools” (p. 19). In addition, college attendance data demonstrated that “the four-year college attendance rate for female graduates is 3.1 percentage points higher for all-girls schools than for coeducational schools” (p. 20). The advantage of “all-girls schools over coeducational schools in sending female students to four-year colleges is fairly substantial”, with the study showing that “female students from all-girls schools are less likely to attend two-year junior colleges” (p. 21).
• A 2012 PhD thesis by Dana Diaconu concluded that girls from Hong Kong and New Zealand “seemed to have benefited more from single-sex education than coeducation” (p. 248). Diaconu examined the Trends in Mathematics and Science Study (TIMSS) databases for 1995, 1999 and 2003, finding that the advantage of Hong Kong girls from single-sex schools in TIMSS 2003 in science scores “remained statistically significant … even after accounting for differences in student background and school characteristics” (p. 248).
• Suzanne Link’s 2012 study of the 1999 Trends in Mathematics and Science Study (TIMSS) data for South Korean middle schools found “positive effects of single-sex schooling for girls” in mathematics. The effects “are not only highly statistically significant and non-negligible in their magnitude, but also highly relevant since math[s] performance is consistently linked to future earnings” (p. 2).
• Belfi et al.’s review of the literature on class composition by gender and ability in secondary school found that “single-sex classes are advantageous for girls’ school well-being and academic self-concept” (Belfi, Goos, De Fraine & Van Damme, 2011, p. 2).
• Veronica Cabezas found that: “Girls in single-sex schools perform better academically than their counterparts in coeducational schools, after holding constant measures of selection, background, peers and school factors” (Cabezas, 2010, p. 227).
•Katherine Bradley investigated single-sex education and its impact on academic achievement, concluding that “the single-sex environment provides females with the best opportunity for academic achievement” (Bradley, 2009, p. 119).