Skip to main content
. Author manuscript; available in PMC: 2019 Sep 1.
Published in final edited form as: Mayo Clin Proc. 2018 Sep;93(9):1256–1265. doi: 10.1016/j.mayocp.2018.03.005

Table 2.

Relative Contributions of Temporal Trends in Age, BMI, and BMI-Specific Incidence Rates to Temporal Trends in the Incidence of Diverticulitis

Raw Incidence, Mean Incidence of Diverticulitis per 100,000 People
Year Mean (Range) Scenario 1a Scenario 2b Scenario 3c Scenario 4d
1980 77.2 (59.3-95.0) 60.8 60.8 60.8 60.8
1985 96.4 (77.0-115.7) 68.1 65.0 64.5 63.5
1990 80.1 (63.1-97.1) 77.6 72.0 70.9 65.4
1995 75.2 (59.4-90.9) 89.9 78.4 80.9 69.9
2000 102.3 (84.7-119.8) 99.8 83.9 89.4 72.5
2007 125.2 (106.8-143.6) 117.8 90.5 106. 4 79.6
Increase from
1980 to 2007		 … 57.0 29.7 45.6 18.8

Abbreviation: BMI, body mass index.

a

Scenario 1 assumptions: age, actual; BMI, actual; BMI-specific incidence rate, actual for BMI <25 kg/m2 and fixed at the 1980 rate for BMI ≥25 kg/m2.

b

Scenario 2 assumptions: age, fixed at 1980 rate; BMI, actual; BMI-specific incidence rate, actual for BMI <25 kg/m2 and fixed at the 1980 rate for BMI ≥25 kg/m2.

c

Scenario 3 assumptions: age, actual; BMI, actual; BMI-specific incidence rate, fixed at the 1980 rate for all BMI categories.

d

Scenario 4 assumptions: age, actual; BMI, distribution among BMI categories in 1980 was used for all subsequent periods; BMI-specific incidence rate, fixed at the 1980 rate for all BMI categories.