Trends in Sociodemographic Disparities in Colorectal Cancer Staging and Survival: A SEER-Medicare Analysis.

For socioeconomic factors, individuals residing in areas with the highest quartile of median household income had a statistically significant 7%–12% lower risk of metastatic CRC in 3 of the 4 periods (1991–1997: RRR 0.90; 95% CI, 0.81–1.00; 2001–2005: RRR 0.93; 95% CI, 0.87–1.00; and 2006–2010: RRR 0.88; 95% CI, 0.81–0.95); the risk estimate from 1998 to 2001 was consistent with that of the other 3 periods but did not reach statistical significance.

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