Table 2. Regional distribution for counties with low, moderate, and high rates of diverticulitis.

	Northeast	Midwest	South	West
Total counties (%)	31 (30.1)	9 (8.7)	33 (32.0)	30 (29.1)
Population (%)	20,119,483 (30.4)	6,233,434 (9.4)	15,672,640 (23.7)	24,147,395 (36.5)
3-y diverticulitis count (%)	58,202 (36.4)	18,082 (11.3)	47,833 (30.0)	35,864 (22.4)
Range of diverticulitis rates (per 100,000)	18.8–148.9	55.2–131.6	45.7–123.5	9.1–93.6
Median diverticulitis rate (per 100,000)	98.2	73.4	85.2	65.2
Low diverticulitis counties (n = 34)	5 (16.1%)	3 (33.3%)	6 (18.2%)	20 (66.7%)
Moderate diverticulitis counties (n = 35)	9 (29.0%)	3 (33.3%)	13 (39.4%)	10 (33.3%)
High diverticulitis counties (n = 34)	17 (54.8%)	3 (33.3%)	14 (42.4%)	0 (0%)

Notes: Defined by the U.S. Census Bureau. The 3-y diverticulitis count for the state of Utah was projected based on data from 2003 and 2004.