. Author manuscript; available in PMC: 2020 Mar 1.

Published in final edited form as: Cancer Epidemiol Biomarkers Prev. 2019 Jun 14;28(9):1409–1416. doi: 10.1158/1055-9965.EPI-19-0021

Table 2.

Uniqueness test results for combinations of categorical measures of census tract-level socioeconomic status (SES) and rurality.

SES	RUCA-based rurality	Census-based rurality	Unique tracts (n)	Unique tracts (%)	Cancer cases in unique tracts (SEER 2006–2014) (%)
5 categories	n/a	n/a	0	0.000	0.000
5 categories	4 categories	4 categories	4	0.021	0.027
5 categories	2 categories	4 categories	1	0.005	0.004
5 categories	4 categories	3 categories	2	0.011	0.015
5 categories	2 categories	3 categories	1	0.005	0.004
5 categories	4 categories	2 categories	2	0.011	0.012
5 categories	2 categories	2 categories	0	0.000	0.000

Note. Analysis limited to census tracts located in SEER 18 catchment areas excluding Alaska. Shaded categorization scheme was selected for incorporation into a specialized SEER 18 cancer incidence database, available upon request. SES=socioeconomic status; RUCA=Rural Urban Commuting Areas; SEER=Surveillance, Epidemiology, and End Results.