TABLE 3—

Sensitivity and Classification Ratios for Cases That Linked to IHS: NPCR-SEER Data, United States, 1990–2009

	No. AI/AN CHSDA Cases		No. AI/AN Non-CHSDA Cases		Sensitivitya		Classification Ratiob
Group	IHS	Registry	IHS	Registry	CHSDA	Non-CHSDA	CHSDA	Non-CHSDA
Male and Femalec	11 351	8811	1202	469	77.6	39.0	1.29	2.56
Male	5233	4046	512	204	77.3	39.8	1.29	2.51
Female	6118	4765	690	265	77.9	38.4	1.28	2.6
Northern Plainsc	2387	2106	416	297	88.2	71.4	1.13	1.4
Alaskad	1260	1253	NA	NA	99.4	NA	1.01	NA
Southern Plainsc	3817	2144	296	41	56.2	13.9	1.78	7.22
Southwestc	2314	2062	57	36	89.1	63.2	1.12	1.58
Pacific Coastc	1228	1064	70	40	86.6	57.1	1.15	1.75
Eastc	345	182	363	55	52.8	15.2	1.9	6.6
Urbanc	4593	3349	526	219	72.9	41.6	1.37	2.4
Ruralc	6758	5462	292	152	80.8	52.1	1.24	1.92

Note. AI/AN = American Indian and Alaska Native; CHSDA = Contract Health Service Delivery Areas; IHS = Indian Health Service; NA = not applicable; NPCR = National Program of Cancer Registries; SEER = Surveillance, Epidemiology and End Results. Analysis includes AI/AN persons of Hispanic origin. Registries used: (43 states) AK,^z AZ^z, AR, CT,^z DE, GA, HI, ID^z, IA,^z IN,^z KY, LA,^z ME,^z MD, MA,^z MI,^z MS,^z MO, MT,^z NE^z, NV,^z NH, NJ, NM,^z NY,^z NC,^z ND,^z OH, OK,^z OR,^z PA,^z RI,^z SC,^z SD,^z TN, TX,^z UT,^z VT, VA, WA,^z WV, WI,^z WY,^z (^zindicate states with at least 1 county designated as CHSDA). Analyses limited to cases who linked to IHS.

Source. Cancer registries in the Centers for Disease Control and Prevention’s NPCR or the National Cancer Institute’s SEER.

^aPercentage of IHS cases also coded as an AI/AN person in the cancer registry of all IHS cases.

^bRatio of the total number of cases classified as an AI/AN person in IHS to the total number of cases classified as an AI/AN person in the cancer registry.

^cIndicates statisticially significant differences (P < .01) between the number of AI/AN cases in CHSDA and non-CHSDA.

^dAll counties are CHSDA counties.