Are nursing homes fudging their staffing and quality numbers to obtain more favorable Five-Star ratings? A new report suggest such practices may be taking place.

Researchers from the Brookings Institution and the University of Connecticut School of Business examined operators’ self-reporting trends in these two categories between 2010 and 2013.

They found that up to 1 in 8 facilities were in inflating helpful scores. The study suggests that some facilities may be “developing strategies to manipulate the system and in ate their ratings.”

“[Our] results can be used to strategically focus future audits on the nursing homes which are most likely to be inflators, and help CMS improve the rating system,” the authors noted.