In last year’s presidential election, younger blacks voted in greater proportions than whites for the first time and black women turned out at a higher rate than any other racial, ethnic and gender group, a census analysis released Monday confirmed.

As a result, in the election that produced the nation’s first black president, the historic gap between black and white voter participation rates over all virtually evaporated.

The Census Bureau’s survey also found striking contrasts in why people said they did not vote. More than three times as many whites as blacks said they did not like the candidates or campaign issues.

Over all, 18 percent of nonvoters said they were too busy, 15 percent said they were prevented because of an illness or disability and 13 percent each said they were not interested or did not like the candidates or issues.