Teachers who got bad-performance ratings in the past school year were likelier to be teaching in high-poverty schools or in schools with high percentages of black, Hispanic or low-achieving students, a new analysis found.

The StudentsFirstNY report on the roughly 3 percent of teachers who were rated “unsatisfactory” — known as a “U-rating” — for the 2011-12 school year found that they were distributed unequally throughout the system.

The top 10 percent of schools — 77 of the 1,509 in the study — had nearly 19 percent of teachers rated unsatisfactory. On the other hand, nearly half of principals didn’t issue a single U-rating.

The analysis concluded that students in high-poverty schools were at least three times more likely to be taught by a U-rated teacher than were students in low-poverty schools.

“A concentration of ineffective teachers serving specific student populations is an injustice,” said StudentsFirstNY executive director Micah Lasher. The group advocates for increased teacher quality and school choice.

United Federation of Teachers President Michael Mulgrew and a number of education advocates said the main solution was greater support of teachers in challenging schools.