A New York state appellate court has ruled New York City must release reports that measure public school teachers’ effect on their student test scores — complete with the teachers’ names.

In a blow to the city’s teachers union, the court ruled Thursday that teachers’ names did not fall within six exemptions that protect personal privacy under the law. Media organizations, including The Wall Street Journal, had requested the data; the union sued to prevent its release.

“When balancing the privacy interests at stake against the public interest in disclosure of the information … we conclude that the requested reports should be disclosed,” the court wrote. “Indeed, the reports concern information of a type that is of compelling interest to the public, namely, the proficiency of public employees in the performance of their job duties.”

The reports are issued to about 12,000 teachers annually, covering teachers in fourth through eighth grades whose students take standardized English and math state tests. They attempt to measure whether teachers helped their students score better than expected, based on a statistical model that incorporates a variety of factors, including how often students were absent, their race and gender, the class size and whether they had been held back.

The city teachers union, the United Federation of Teachers, has argued that the reports are based on faulty tests and the data is unreliable because the margin of error is so wide. In a statement Thursday, UFT President Michael Mulgrew said the union was already in the process of appealing the ruling.

“Experts agree that an ‘accountability’ measure with a 58-point swing — like the DOE’s teacher data system — is worse than useless. Parents and teachers need credible, accurate assessments rather than guesswork,” Mulgrew said.

Some teachers worry that the reports will be misinterpreted by parents and students alike. New York City principals have already started using the data reports to determine whether newer teachers should receive tenure.