Students in the city’s charter and renaissance schools have outperformed pupils in traditional public schools, according to an academic study released Monday.

The study by the Stanford University Center for Research on Education Outcomes, or CREDO, noted mixed results for student performance in school years from 2014-15 through 2016-17.

Overall, it said Camden students “posted weaker learning gains compared to the state average gains in reading” throughout the three-year period.

But it said city-wide gains in math, after lagging in the first year, “caught up” with the state average in 2015-16 and 2016-17.