Table 2.
Factors associated with lack of treatment for regional gastric cancer
| Factor | OR (95% CI) | p |
|---|---|---|
| Year | ||
| 2007–2009 | Reference | |
| 2004–2006 | 2.00 (1.70–2.36) | < 0.001 |
| 2001–2003 | 1.52 (1.28–1.79) | < 0.001 |
| SEER region | ||
| Northeast | Reference | |
| Midwest | 1.11 (0.82–1.49) | 0.505 |
| South | 1.38 (1.08–1.76) | 0.011 |
| West | 3.10 (2.56–3.76) | < 0.001 |
| Age (years) | ||
| 65–69 | Reference | |
| 70–74 | 1.24 (0.98–1.56) | 0.076 |
| 75–79 | 1.26 (1.01–1.60) | 0.049 |
| ≥ 80 | 1.90 (1.53–2.36) | < 0.001 |
| Sex | ||
| Female | Reference | |
| Male | 1.30 (1.14–1.48) | < 0.001 |
| Race | ||
| White | Reference | |
| Black | 1.50 (1.23–1.82) | < 0.001 |
| Asian | 0.64 (0.51–0.80) | < 0.001 |
| Othera | 1.03 (0.84–1.26) | 0.788 |
| Median household incomeb | ||
| Q4 | Reference | |
| Q3 | 1.05 (0.85–1.28) | 0.674 |
| Q2 | 0.99 (0.78–1.25) | 0.910 |
| Q1 | 0.91 (0.69–1.20) | 0.483 |
| At least 12 years of educationb | ||
| Q4 | Reference | |
| Q3 | 1.38 (1.13–1.69) | 0.001 |
| Q2 | 1.21 (0.96–1.52) | 0.100 |
| Q1 | 1.30 (1.01–1.69) | 0.045 |
| Charlson comorbidity index | ||
| 0 | Reference | |
| 1 | 0.23 (0.19–0.27) | < 0.001 |
| ≥ 2 | 0.26 (0.21–0.31) | < 0.001 |
| Histology | ||
| Adenocarcinoma | Reference | |
| Squamous cell carcinoma | 3.28 (2.13–5.03) | < 0.001 |
| Other | 0.98 (0.69–1.37) | 0.878 |
| Tumor location | ||
| Pylorus antrum/pylorus | Reference | |
| Gastric, NOS | 1.34 (1.10–1.63) | 0.003 |
| Body/less or greater | 0.98 (0.84–1.15) | 0.828 |
| Overlapping | 1.11 (0.89–1.38) | 0.346 |
| Fundus | 0.93 (0.67–1.31) | 0.693 |
| Grade | ||
| Well/moderately differentiated | Reference | |
| Poorly/undifferentiated | 1.03 (0.88–1.20) | 0.740 |
| Unknown | 2.64 (2.01–3.46) | < 0.001 |
IQR interquartile range, NCI National Cancer Institute, SEER Surveillance, Epidemiology, and End Results
a
Hispanic and Native American
b
Defined using Census zip code data categorized into quartiles