for the birth cohort 1948-1958, yielding an adjusted incidence rate of (87/69.4) * 4.22 = 5.29. The overall rate from Step 4 was used as the reference rate in order to facilitate comparisons across birth cohort for individual health districts and counties, and to allow comparisons among health districts and counties within birth cohort. See Box D.1 for a description of the Idaho population by health districts.

Step 11. The adjusted rates for the state of Idaho were calculated by birth cohort using the standardized incidence ratio for that birth cohort (observed/expected), with expected cases based upon age- and sex-specific rates for all birth cohorts

BOX D.1 Description of Idaho Population

The population of the state of Idaho in 1996 was estimated to be 1,189,251, made up of 594,604 males and 594,647 females (U.S. Bureau of the Census). Idaho comprises 44 counties grouped into seven health districts. The composition of the health districts and population estimates by sex are shown below:

District

Counties

Males

Females

District 1

Benewah, Bonner, Boundary, Kootenai, Shoshone

80,792

81,548

District 2

Clearwater, Idaho, Latah, Lewis, Nez Perce

49,574

48,568

District 3

Adams, Canyon, Gem, Owyhee, Payette, Washington

84,753

85,602

District 4

Ada, Boise, Elmore, Valley

147,684

149,119

District 5

Blaine, Camas, Cassia, Gooding, Jerome, Lincoln, Minidoka, Twin Falls

77,788

77,139

District 6

Bannock, Bear Lake, Bingham, Butte, Caribou, Franklin, Oneida, Power

77,425

77,227

District 7

Bonneville, Clark, Custer, Fremont, Jefferson, Lemhi, Madison, Teton 

76,588

75,444



The National Academies | 500 Fifth St. N.W. | Washington, D.C. 20001
Copyright © National Academy of Sciences. All rights reserved.
Terms of Use and Privacy Statement