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Incidence Rate Ratios (IRRs) for Diverticulitis in Body Mass Index (BMI) Categories, Olmsted County, Minnesota, 1980-2007. In 1980, compared to the reference group IRR (ie, women with a BMI <25 kg/m2), the IRRs were 2.8 and 4.9, respectively, for women and men with a BMI of 30 kg/m2 or more. Over time, the IRRs converged among BMI categories in women and separately in men.
