Table 3.

Association of preoperative staging studies and three-year mortality in 37,862 Medicare beneficiaries who underwent colectomy for colon cancer. SCAN refers to abdominopelvic computed tomography or magnetic resonance imaging scan; SCOPE, colonoscopy or flexible sigmoidoscopy. Adjusted odds ratios (ORs) and confidence intervals (CIs) are adjusted for age, gender, race, marital status, SEER registry, rural-urban residence location, hospitalization in the previous year, tumor stage, tumor location, tumor grade, admission type, census-tract median household income, and census-tract education; OR, odds ratio; CI, confidence interval.

Preoperative Staging	Crude OR	95% CI	Adjusted OR	95% CI
None	Reference		Reference
SCAN only	1.37	1.22–1.54	1.22	1.08–1.38
SCOPE only	0.56	0.52–0.61	0.71	0.65–0.78
SCAN plus SCOPE	0.64	0.59–0.69	0.75	0.69–0.82