1997 Report Index

COLON
Incidence and Mortality Summary
Male Female Total
Age-adjusted incidence
rate per 100,000

# of new invasive cases
# of new in-situ cases
# of deaths
28.6

175
17
82

25.9

203
16
68


27.5

378
33
150

Total Cases by County
Ada
Adams
Bannock
Bear Lake
Benewah
Bingham
Blaine
Boise
Bonner
Bonneville
Boundary
Butte
Camas
Canyon
Caribou
 84
4
20
1
4
8
3
3
10
20
2
1
0
39
3
Cassia
Clark
Clearwater
Custer
Elmore
Franklin
Fremont
Gem
Gooding
Idaho
Jefferson
Jerome
Kootenai
Latah
Lemhi
 4
0
7
1
3
4
0
11
4
3
6
14
40
11
2
Lewis
Lincoln
Madison
Minidoka
Nez Perce
Oneida
Owyhee
Payette
Power
Shoshone
Teton
Twin Falls
Valley
Washington
Unknown
 3
1
5
5
27
2
1
6
4
7
0
29
2
3

Risk and Associated Factors
Age Rates increase with age; the vast majority of cases occur after age 50.
Gender Incidence rates are slightly higher in males.
Genetics Specific genetic alterations have been recognized in several hereditary conditions with high risk of colon cancer such as familial polyposis. These conditions account for about six percent of colon cancer cases.
Diet Strong evidence that diets high in fat and low in fiber contribute to increased risk of colon cancer have been shown.
Other Individuals with a close family history of this cancer and those with a personal history of certain other cancers are at increased risk. Regular, moderate physical activity is associated with lower rates of this cancer.
Special Notes
Mean age-adjusted incidence rate across health districts:
95% confidence interval on the mean age-adjusted incidence rate:
Median age-adjusted incidence rate of health districts:
Range of age-adjusted incidence rate for health districts:
SEER rate (1991-1995):
27.2
24.4-29.9
26.2
24.0-34.8
32.7

No cases of colon cancer were diagnosed in persons less than 20 years of age. There was a steep increase in age-specific incidence rates starting at age 55 and peaking in the age group 85+ for males, and 75-79 for females. No health districts had significantly more cases than expected based upon rates for the remainder of Idaho.

Stage at Diagnosis