Fewer third-grade boys and girls at Willow scored proficient on the math and English portions of the M-Step last year compared to the 2014-15 school year, according to state data.
Intent on narrowing the achievement gap between male and female students, officials introduced separate core classrooms at Willow in the fall of 2015.
Allison of the University of Wisconsin-Madison, also found "trivial differences" in performance in math and science between the students in co-educational settings and those in single-gender settings in controlled studies.
Single-gender schools have also fueled legal challenges.
The American Civil Liberties Union, a major opponent of single-gender schools and classes, warns districts against going down that route because they are likely to bump up against civil rights and education laws, including Title IX, which bars sex discrimination in education programs that receive federal funds.
The organization has challenged assertions that boys and girls learn differently and need different educational methods, one of the justifications districts make for creating such schools.
LANSING - Two years after implementing separate core subject classrooms for boys and girls at Lansing’s Willow Elementary, the district’s Board of Education voted Thursday night to suspend the practice. The district fell afoul of federal officials because it didn’t seek their approval prior to implementing the plan, according to Lansing Superintendent Yvonne Caamal Canul.