Skip to main content
. 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 2.

Colorectal cancer incidence by IHS region and age 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 Age at diagnosis N % Ratec N % Ratec RRd CI
Northern Plains <50 years 114 16.60 13.9 1,899 9.70 8.2 1.69e 1.38–2.05
50–64 years 286 41.60 124.8 5,575 28.60 62.5 2.00e 1.77–2.25
65–74 years 153 22.30 207.5 4,880 25.00 124.7 1.66e 1.40–1.96
75–84 years 112 16.30 377.3 4,524 23.20 215.3 1.75e 1.44–2.11
85+ years 22 3.20 277.2 2,620 13.40 265.6 1.04 0.65–1.58
Alaska <50 years 70 16.70 21.5 112 12.60 7.6 2.85e 2.07–3.87
50–64 years 158 37.70 168.9 348 39.10 63.6 2.66e 2.19–3.22
65–74 years 97 23.20 327.1 250 28.10 132.1 2.48e 1.93–3.16
75–84 years 75 17.90 573.2 136 15.30 204.5 2.80e 2.09–3.74
85+ years 19 4.50 507.9 44 4.90 190.7 2.66e 1.47–4.66
Southern Plains <50 years 155 15.30 14.2 771 9.9 8.9 1.60e 1.34–1.90
50–64 years 395 38.90 128.6 2,316 29.60 72.0 1.79e 1.60–1.99
65–74 years 256 25.20 231.3 2,284 29.20 151.7 1.52e 1.33–1.74
75–84 years 147 14.50 300.2 1,680 21.50 203.7 1.47e 1.24–1.75
85+ years 63 6.20 451.6 763 9.80 225.4 2.00e 1.52–2.59
Pacific Coast <50 years 90 14.40 9.7 3,557 9.60 7.8 1.24 0.99–1.53
50–64 years 242 38.70 80.6 11,252 30.20 64.4 1.25e 1.10–1.42
65–74 years 161 25.70 153.3 9,509 25.50 115.0 1.33e 1.13–1.56
75–84 years 92 14.70 212.8 8,054 21.60 196.4 1.08 0.87–1.33
85+ years 41 6.50 296.8 4,873 13.10 252.9 1.17 0.84–1.59
East <50 years 32 15.00 8.7 4,145 9.70 8.5 1.02 0.70–1.45
50–64 years 93 43.50 78.4 12,364 28.90 65.9 1.19 0.96–1.46
65–74 years 52 24.30 116.0 10,961 25.70 125.0 0.93 0.69–1.22
75–84 years 23 10.70 123.0 9,506 22.30 202.9 0.61e 0.38–0.91
85+ years 14 6.50 206.2 5,746 13.40 252.0 0.82 0.45–1.37
Southwest <50 years 130 16.70 8.3 1,438 8.50 7.1 1.16 0.96–1.39
50–64 years 311 39.90 74.3 4,941 29.20 63.6 1.17e 1.04–1.31
65–74 years 175 22.40 120.3 4,760 28.10 110.4 1.09 0.93–1.27
75–84 years 119 15.30 173.7 3,953 23.30 178.0 0.98 0.81–1.17
85+ years 45 5.80 202.9 1,854 10.90 218.1 0.93 0.68–1.25
All regions <50 years 591 15.80 11.6 11,922 9.50 8.1 1.43e 1.31–1.55
50–64 years 1,485 39.70 101.2 36,796 29.40 64.9 1.56e 1.48–1.64
65–74 years 894 23.90 175.6 32,644 26.10 121.1 1.45e 1.35–1.55
75–84 years 568 15.20 255.8 27,853 22.30 198.9 1.29e 1.18–1.40
85+ years 204 5.50 298.2 15,900 12.70 248.3 1.20e 1.04–1.38

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; 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.