Efforts to lower health care costs in the United States have focused at times on demands to reform the medical malpractice system, with some researchers asserting that large, headline-grabbing and “frivolous” payouts are among the heaviest drains on health care resources. But a new review of malpractice claims by Johns Hopkins researchers suggests such assertions are wrong.

In their review of malpractice payouts over $1 million, the researchers say those payments added up to roughly $1.4 billion a year, making up far less than 1 percent of national medical expenditures in the United States.