A Chicago-based hotel chain is getting poor marks in a new national study of workplace safety.

A peer-reviewed study of 50 hotels in the United States suggests that Hyatt housekeepers are almost twice as likely to suffer on-the-job injuries as their Hilton counterparts. Looking at all hotel jobs, Hyatt places fourth for safety among the top five hospitality chains.

The American Journal of Industrial Medicine is publishing the study in January. Funding for the work came from UNITE HERE, the workers’ union.

The research examines 2,865 injuries over three years. The data suggest that women hotel workers, especially Latinas, face the greatest danger.

In Chicago, the union’s contracts with the hotels expired August 31. In September, the union tried to strengthen its hand in contract-renewal talks by blocking rush-hour traffic in front of a Hyatt downtown.

Hyatt says it hasn’t had a chance to review the study, but says it has been reducing the frequency and severity of workplace injuries.