WASHINGTON, Feb. 21 — The Bush administration says it improperly altered a report documenting large racial and ethnic disparities in health care, but it will soon publish the full, unexpurgated document. "There was a mistake made," Tommy G. Thompson, the secretary of health and human services, told Congress last week. "It's going to be rectified." Mr. Thompson said that "some individuals took it upon themselves" to make the report sound more positive than was justified by the data. The reversal comes in response to concerns of Democrats and the Senate majority leader, Bill Frist, Republican of Tennessee. They are pushing...