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RACINE — State test results were released Tuesday for private voucher schools — but state officials and others cautioned against using those results for much comparison or analysis.

That’s because so few voucher students take the test; they’re often in grades that aren’t tested or parents opt them out of testing altogether. Of about 1,200 Racine voucher students, only 511 were tested, according to the Wisconsin Department of Public Instruction.

“The low number of students tested in the Racine voucher program precludes making a detailed analysis of results across years,” a DPI press release said.

Nonetheless, the state did release numbers. In reading, 18.6 percent of voucher students scored proficient or advanced on state tests administered this past fall, down from 19.5 percent scoring proficient or advanced in fall 2012. In math, 21.3 percent of voucher students scored proficient or advanced this past fall, down from 24.1 scoring proficient or advanced in fall 2012, state data shows.