PITTSBURGH — The city's black population is one of the poorest in the nation and black men here are nearly twice as likely as white men to be unemployed, according to an in-depth report released Tuesday by the University of Pittsburgh.

The report, touted as the most comprehensive ever done on multiple races in Pittsburgh, brings to light the disparities in wealth, income and quality of life between blacks and whites in the city and its suburbs.

James Maher, the University of Pittsburgh's provost, said the goal was a study so reliable it could not be ignored.

The issues addressed in the report by the school's Center on Race and Social Problems concern everyone "but are so complicated we really don't have solutions," Maher said.

One of Pittsburgh's major problems is its lack of diversity and highly segregated neighborhoods, researchers said. These factors contribute to the persistent employment and population-retention problems the region has suffered since the steel industry collapsed in the 1980s.

There are nearly 224,000 white people in the city of Pittsburgh compared with 91,000 blacks, who make up 27 percent of the population. The broader seven-county metropolitan area has 2.4 million people — 8 percent black and 90 percent white.

Income differences between blacks and whites in the region — whites' median annual income exceeds that of blacks by more than $10,000 — is a symptom of other disparities, including the high rate of black children who live in households led by single women.

Only about one-quarter of black women in the region are married.

In Pittsburgh, 17 percent of black men are unemployed, compared with 12 percent nationwide. White men in Pittsburgh have an unemployment rate of about 8 percent, compared with 4 percent nationally.