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A new report from the U.S. Department of Education's National Center for Education Statistics shows that the proportion of adults with a work credential typically increases with educational attainment, excluding those adults with a doctoral degree. The figures range from 6 percent for adults with a high school diploma having a work credential to 68 percent for people with a professional degree.

Over half of credentialed adults -- 53 percent -- have less than a bachelor's degree.

Work credentials are often used as an alternative or supplement to education credentials like diplomas and degrees. The credentials include occupational licenses and certifications. The most common work credentials are obtained in health care, education and the trades, according to the report.