Philadelphia students lag behind in science achievement compared to students in other large cities, according to a recent study.

The report, released last week by the National Assessment of Educational Progress, tracked the results of fourth and eighth grade public school students in selected urban school districts.

Most of the 17 participating districts scored lower than the national average. Of the total number of districts assessed, fourth-graders in Philadelphia scored 19 percent lower than the national average and eighth-graders scored 20 percent lower. Students from Baltimore, Chicago, Cleveland, Detroit, Fresno, Los Angeles and Milwaukee also scored lower than the large-city average, according to the study. None of the districts had greater than 1 percent of students in the advanced range, and students of color and economically disadvantaged students in large urban districts continue to underperform compared with their national peers.