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Nine percent of top-selling packaged food products in the United States contain partially hydrogenated oils, a new study has found. Most of these products report 0 grams of trans fat per serving.

Researchers estimated the prevalence of partially hydrogenated oils in more than 4,000 top-selling packaged foods in the country. They obtained the data from the National Salt Reduction Initiative (NSRI) Packaged Food Database. 

The researchers found that 9 percent of products listed partially hydrogenated oils in their ingredient information. Of these products, 16 percent reported trans fat content per serving in excess of 0 grams or 0.5 grams per serving, while 84 percent listed trans fat as 0 grams per serving, the press release added. 

"Government efforts to eliminate partially hydrogenated oils from packaged foods will substantially reduce exposure to this known cardiovascular disease risk factor," the authors wrote.

The study has been published in the U.S. Centers for Disease Control and Prevention's Preventing Chronic Disease.