Teachers at charter schools are more than twice as likely to leave the profession as their peers at traditional public schools, according to a new study by the federally funded National Center on School Choice.

That could bode poorly for long-term trends in D.C. schools, where the charter movement is among the most successful in the nation and charter students make up about a third of all public school students. Past studies have shown teacher stability to be a major factor in a school’s progress.