Table 1.
Patient Characteristics
| Characteristic | No Adjuvant Treatment
|
Adjuvant Treatment
|
P* | ||
|---|---|---|---|---|---|
| No. | % | No. | % | ||
| No. of patients | 522 | 209 | |||
| Median age at diagnosis | 69.9 | 69.5 | .161 | ||
| Year of diagnosis | .061 | ||||
| 1991-1993 | 319 | 61.11 | 120 | 57.42 | |
| 1994-1996 | 134 | 25.67 | 47 | 22.49 | |
| 1997-1999 | 69 | 13.22 | 42 | 20.10 | |
| Ethnicity | .544 | ||||
| White | 477 | 91.38 | 186 | 89.00 | |
| African-American | 26 | 4.98 | 12 | 5.74 | |
| Other | 19 | 3.64 | 11 | 5.26 | |
| Marital status | .127 | ||||
| Single/other | 83 | 15.90 | 24 | 11.48 | |
| Married | 439 | 84.10 | 185 | 88.52 | |
| SEER site | < .005 | ||||
| San Francisco | 67 | 12.84 | 20 | 9.57 | |
| Connecticut | 30 | 5.75 | 8 | 3.83 | |
| Detroit | 53 | 10.15 | 19 | 9.09 | |
| Hawaii | 8 | 1.53 | 7 | 3.35 | |
| Iowa | 63 | 12.07 | 40 | 19.14 | |
| New Mexico | 40 | 7.66 | 9 | 4.31 | |
| Seattle | 80 | 15.33 | 27 | 12.92 | |
| Utah | 70 | 13.41 | 13 | 6.22 | |
| Atlanta | 15 | 2.87 | 15 | 7.18 | |
| San Jose-Monterey | 31 | 5.94 | 7 | 3.35 | |
| Los Angeles | 65 | 12.45 | 44 | 21.05 | |
| Comorbidities | .011 | ||||
| 0 | 257 | 51.3 | 94 | 40.87 | |
| 1 | 135 | 26.95 | 71 | 30.87 | |
| 2 | 60 | 58.82 | 42 | 18.26 | |
| ≥ 3 | 49 | 9.78 | 23 | 10 | |
| Tumor size | .437 | ||||
| ≤ T2c | 156 | 29.89 | 53 | 25.36 | |
| T3a | 119 | 22.80 | 48 | 22.97 | |
| T3b-T4 or unknown | 247 | 47.32 | 108 | 51.67 | |
| Tumor grade | .009 | ||||
| Well differentiated | 11 | 2.11 | < 5 | < 2.4 | |
| Moderately differentiated | 259 | 49.62 | 78 | 37.32 | |
| Poorly differentiated | 252 | 48.28 | 127 | 60.77 | |
| Nodal status | < .005 | ||||
| Single node < 2 cm | 153 | 29.31 | 31 | 14.83 | |
| Single node 2-5 cm or multiple nodes | 67 | 12.84 | 75 | 35.89 | |
| Regional nodes NOS | 302 | 57.85 | 103 | 49.28 | |
| Receipt of radiation | 77 | 14.75 | 18 | 8.61 | .026 |
| Median income, $† | 40,654 | 39,058 | .3563 | ||
| % with college education† | 26.65 | 26.5 | .922 | ||
| Residence | .458 | ||||
| Metropolitan | 404 | 77.39 | 167 | 79.90 | |
| Nonmetropolitan | 118 | 22.61 | 42 | 20.10 | |
Abbreviations: SEER, Surveillance, Epidemiology, and End Results; NOS, not otherwise specified.
*
P values are for χ2 tests for all variables, with the exception of age, median income, and percent with college education. The t-test was used for those covariates.
†
Households, by census tracts: eighteen participants did not have information about median income or college education available. These variables were not included in the final model.