In 2006, of the nine Midwest states reporting, Iowa registered the highest with a total case incidence rate for the private sector of 6.0 cases per 100 full-time employees. Illinois recorded the lowest numbers with 4.1 cases. Incidence rates by major industry division varied greatly between states. In manufacturing, the total case incidence rate ranged from 9.0 in Iowa to 6.0 in Illinois. In the construction industry, the most hazardous of the major industry divisions, incidence rates ranged from 7.9 in Iowa to 4.7 in both Michigan and Missouri. Data was not available for North Dakota, Ohio, and South Dakota.