Teacher shortages continue to grow nationwide, with nearly one in eight positions either vacant or staffed by uncertified or unqualified teachers, new research concludes.

Based on available national data, 411,549 teaching positions were either vacant or filled by teachers not fully certified, according to the latest report from the Learning Policy Institute.

More specifically, 48 states plus the District of Columbia employed an estimated 365,967 teachers who are not adequately certified for their roles. Some 45,592 positions were left unfilled.