Medical costs per workers' compensation claim in Illinois showed slower growth in 2007 following implementation of the medical fee schedule in 2006, according to a study from the Workers Compensation Research Institute (WCRI). The study, Monitoring the Impact of Illinois Regulatory Changes: CompScope Medical Benchmarks, 10th Edition, reported that growth in medical costs per claim slowed to 5 percent after a 12 percent average annual growth in the three prior years.