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. Author manuscript; available in PMC: 2022 Oct 1.
Published in final edited form as: Cancer Epidemiol Biomarkers Prev. 2021 Aug 2;30(10):1799–1806. doi: 10.1158/1055-9965.EPI-21-0343

Table 3.

Colorectal cancer incidence by IHS region and stage at diagnosis for AI/ANa,b and Whitea residents of PRCDA counties, both sexes combined, United States, 2013–2017.

AI/AN White AI/AN:White Rate Ratio
IHS region Stage at diagnosis N % Ratec N % Ratec RRd CI
Northern Plains Localized 223 32.5 19.6 7,081 36.3 13.5 1.45e 1.25–1.67
Regional 267 38.9 25.9 7,138 36.6 13.7 1.89e 1.65–2.15
Distant 161 23.4 14.5 3,967 20.3 7.7 1.88e 1.58–2.22
Unstaged 36 5.2 3.7 1,312 6.7 2.4 1.57e 1.07–2.22
Alaska Localized 165 39.4 35.3 317 35.6 12.3 2.86e 2.33–3.50
Regional 138 32.9 34.1 298 33.5 11.9 2.86e 2.29–3.56
Distant 101 24.1 22.9 206 23.1 8.4 2.72e 2.09–3.51
Unstaged 15 3.6 3.8 69 7.8 3.2 1.20 0.61–2.14
Southern Plains Localized 299 29.4 19.3 2,765 35.4 14.0 1.38e 1.21–1.56
Regional 333 32.8 21.4 2,546 32.6 13.0 1.64e 1.45–1.85
Distant 230 22.6 14.5 1,616 20.7 8.4 1.74e 1.50–2.01
Unstaged 154 15.2 10.1 887 11.4 4.5 2.26e 1.88–2.70
Pacific Coast Localized 216 34.5 14.8 13,459 36.1 12.8 1.15 0.99–1.33
Regional 236 37.7 16.3 13,478 36.2 13.0 1.26e 1.09–1.44
Distant 134 21.4 9.1 7,680 20.3 7.4 1.22e 1.01–1.46
Unstaged 40 6.4 3.2 2,628 7.1 2.4 1.32 0.92–1.82
East Localized 71 33.2 11.0 16,306 38.2 14.2 0.78e 0.60–0.99
Regional 81 37.9 13.4 14,776 34.6 12.9 1.04 0.82–1.30
Distant 51 23.8 7.8 8,743 20.5 7.7 1.01 0.75–1.35
Unstaged 11 5.1 2.1 2,897 6.8 2.4 0.89 0.43–1.61
Southwest Localized 271 34.7 12.0 6,025 35.6 11.7 1.03 0.90–1.16
Regional 256 32.8 11.8 5,492 32.4 10.9 1.09 0.95–1.24
Distant 162 20.8 7.7 3,377 19.9 6.8 1.14 0.96–1.34
Unstaged 91 11.7 4.4 2,052 12.2 4.0 1.12 0.89–1.39
All regions Localized 1,245 33.3 16.6 45,953 36.7 13.3 1.24e 1.17–1.32
Regional 1,311 35.0 18.2 43,728 35.0 12.8 1.43e 1.35–1.51
Distant 839 22.4 11.4 25,589 20.5 7.5 1.51e 1.41–1.62
Unstaged 347 9.3 5.1 9,845 7.9 2.7 1.85e 1.65–2.07

Note: The percentage of the AI/AN population living in a PRCDA-designated county from 2013–2017 was 53.3% for the United States; by IHS region, these percentages were: Alaska = 100%; Pacific Coast = 60.3%; Southwest = 83.9%; Northern Plains = 54.3%; Southern Plains = 56.7%; and East = 16.8%.

Abbreviations: AI/AN, American Indian/Alaska Native; CI, confidence interval; IHS, Indian Health Service; N, number; PRCDA, Purchased/Referred Care Delivery Area; RR, rate ratio.

a

Analyses are limited to persons of non-Hispanic origin.

b

AI/AN race is reported by NPCR and SEER registries or through linkage with the IHS patient registration database.

c

Rates are per 100,000 persons and are age adjusted to the 2000 U.S. standard population (19 age groups—Census P25–1130).

d

Rate ratios are calculated in SEER*Stat prior to rounding of rates and may not equal rate ratios calculated from rates presented in table.

e

Indicates rate ratio is statistically significant (P < 0.05).

Source: National Program of Cancer Registries and Surveillance, Epidemiology, and End Results SEER*Stat Database: U.S. Cancer Statistics American Indian and Alaska Native Incidence Analytic Database - 1998–2017. U.S. Department of Health and Human Services, Centers for Disease Control and Prevention. Released June 2020, based on the 2019 submission.

IHS regions are defined as follows: Alaska*; Northern Plains (IL, IN*, IA*, MI*, MN*, MT*, NE*, ND*, SD*, WI*, WY*); Southern Plains (OK*, KS*, TX*); Southwest (AZ*, CO*, NV*, NM*, UT*); Pacific Coast (CA*, ID*, OR*, WA*, HI); East (AL*, AR, CT*, DE, FL*, GA, KY, LA*, ME*, MD, MA*, MS*, MO, NH, NJ, NY*, NC*, OH, PA*, RI*, SC*, TN, VT, VA*, WV, DC); * identifies states with at least one county designated as PRCDA.