Table 2.
Study Population Demographic and Clinical Characteristics
| Characteristic | Total |
No. of Medical Oncologists in HSA |
P | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| None |
One to Two |
Three to Eight |
≥ Nine |
||||||||
| No. | % | No. | % | No. | % | No. | % | No. | % | ||
| Total | 9,262 | 100.0 | 651 | 7.03 | 884 | 9.54 | 1,655 | 17.87 | 6,072 | 65.56 | |
| Age at diagnosis, years | .37 | ||||||||||
| 67-70 | 1,803 | 19.47 | 125 | 19.2 | 186 | 21.04 | 334 | 20.18 | 1,158 | 19.07 | |
| 71-75 | 2,178 | 23.52 | 151 | 23.2 | 209 | 23.64 | 395 | 23.87 | 1,423 | 23.44 | |
| 76-80 | 2,234 | 24.12 | 171 | 26.27 | 217 | 24.55 | 356 | 21.51 | 1,490 | 24.54 | |
| 81-85 | 1,846 | 19.93 | 120 | 18.43 | 163 | 18.44 | 357 | 21.57 | 1,206 | 19.86 | |
| ≥ 86 | 1,201 | 12.97 | 84 | 12.9 | 109 | 12.33 | 213 | 12.87 | 795 | 13.09 | |
| Race/ethnicity | < .001 | ||||||||||
| White | 7,602 | 82.08 | 564 | 86.64 | 752 | 85.07 | 1,431 | 86.47 | 4,855 | 79.96 | |
| Black | 735 | 7.94 | 46 | 7.07 | 50 | 5.66 | 82 | 4.95 | 557 | 9.17 | |
| Hispanic | 417 | 4.5 | 23 | 3.53 | 56 | 6.33 | 67 | 4.05 | 271 | 4.46 | |
| Other | 508 | 5.48 | 18 | 2.76 | 26 | 2.94 | 75 | 4.53 | 389 | 6.41 | |
| Sex | .13 | ||||||||||
| Male | 3,870 | 41.78 | 276 | 42.4 | 398 | 45.02 | 666 | 40.24 | 2,530 | 41.67 | |
| Female | 5,392 | 58.22 | 375 | 57.6 | 486 | 54.98 | 989 | 59.76 | 3,542 | 58.33 | |
| Marital status | < .001 | ||||||||||
| Married | 4,631 | 50.0 | 329 | 50.54 | 457 | 51.7 | 816 | 49.31 | 3,029 | 49.88 | |
| Not married | 4,258 | 45.97 | 289 | 44.39 | 372 | 42.08 | 764 | 46.16 | 2,833 | 46.66 | |
| Unknown | 373 | 4.03 | 33 | 5.07 | 55 | 6.22 | 75 | 4.53 | 210 | 3.46 | |
| Medicaid status | .08 | ||||||||||
| No Medicaid | 7,617 | 82.24 | 531 | 81.57 | 721 | 81.56 | 1,365 | 82.48 | 5,000 | 82.35 | |
| Medicaid before and after diagnosis | 1,420 | 15.33 | 101 | 15.51 | 139 | 15.72 | 242 | 14.62 | 938 | 15.45 | |
| Medicaid before or after diagnosis* | 225 | 2.43 | 19 | 2.92 | 24 | 2.71 | 48 | 2.9 | 134 | 2.21 | |
| Comorbidity score | .28 | ||||||||||
| 0 | 4,332 | 46.77 | 307 | 47.16 | 421 | 47.62 | 729 | 44.05 | 2,875 | 47.35 | |
| 1 | 2,777 | 29.98 | 196 | 30.11 | 262 | 29.64 | 506 | 30.57 | 1,813 | 29.86 | |
| ≥ 2 | 2,153 | 23.25 | 148 | 22.73 | 201 | 22.74 | 420 | 25.38 | 1,384 | 22.79 | |
| Income | < .001 | ||||||||||
| ≤ $20,000 | 317 | 3.42 | 34 | 5.22 | 43 | 4.86 | 49 | 2.96 | 191 | 3.15 | |
| $20,001-$25,000 | 494 | 5.33 | 40 | 6.14 | 73 | 8.26 | 90 | 5.44 | 291 | 4.79 | |
| $25,001-$30,000 | 779 | 8.41 | 134 | 20.58 | 86 | 9.73 | 153 | 9.24 | 406 | 6.69 | |
| ≥ $30,001 | 7,672 | 82.83 | 443 | 68.05 | 682 | 77.15 | 1,363 | 82.36 | 5,184 | 85.38 | |
| Initiated chemotherapy within 3 months after colectomy | .008 | ||||||||||
| No | 3,640 | 39.3 | 291 | 44.7 | 328 | 37.1 | 623 | 37.64 | 2,398 | 39.49 | |
| Yes | 5,622 | 60.7 | 360 | 55.3 | 556 | 62.9 | 1,032 | 62.36 | 3,674 | 60.51 | |
| Diagnosis year | .41 | ||||||||||
| 2000 | 1,502 | 16.22 | 101 | 15.51 | 134 | 15.16 | 251 | 15.17 | 1,016 | 16.73 | |
| 2001 | 1,552 | 16.76 | 108 | 16.59 | 137 | 15.5 | 306 | 18.49 | 1,001 | 16.49 | |
| 2002 | 1,609 | 17.37 | 119 | 18.28 | 143 | 16.18 | 293 | 17.7 | 1,054 | 17.36 | |
| 2003 | 1,629 | 17.59 | 118 | 18.13 | 161 | 18.21 | 263 | 15.89 | 1,087 | 17.9 | |
| 2004 | 1,478 | 15.96 | 100 | 15.36 | 147 | 16.63 | 268 | 16.19 | 963 | 15.86 | |
| 2005 | 1,492 | 16.11 | 105 | 16.13 | 162 | 18.33 | 274 | 16.56 | 951 | 15.66 | |
| Survival time, months | .52 | ||||||||||
| 6-12† | 999 | 9.78 | 64 | 9.83 | 86 | 9.72 | 191 | 11.54 | 658 | 10.84 | |
| 13-24 | 1,484 | 16.02 | 116 | 17.82 | 159 | 17.99 | 268 | 16.19 | 941 | 15.5 | |
| 25-36 | 1,966 | 21.23 | 148 | 22.73 | 200 | 22.62 | 364 | 21.99 | 1,254 | 20.65 | |
| 37-48 | 1,427 | 15.41 | 96 | 14.75 | 136 | 15.38 | 250 | 15.11 | 945 | 15.56 | |
| 49-60 | 1,211 | 13.07 | 77 | 11.83 | 113 | 12.78 | 208 | 12.57 | 813 | 13.39 | |
| ≥ 60 | 2,175 | 23.48 | 150 | 23.04 | 190 | 21.49 | 374 | 22.6 | 1,461 | 24.06 | |
| Region | < .001 | ||||||||||
| West | 3,648 | 39.39 | 180 | 27.65 | 342 | 38.69 | 595 | 35.95 | 2,531 | 41.68 | |
| Northeast | 2,336 | 25.22 | 84 | 12.9 | 202 | 22.85 | 521 | 31.48 | 1,529 | 25.18 | |
| Midwest | 1,521 | 16.42 | 141 | 21.66 | 148 | 16.74 | 201 | 12.15 | 1,031 | 16.98 | |
| South | 1,757 | 18.97 | 246 | 37.79 | 192 | 21.72 | 338 | 20.42 | 981 | 16.16 | |
| Registry at diagnosis | < .001 | ||||||||||
| San Francisco | 352 | 3.8 | —‡ | — | 23 | 2.6 | 116 | 7.01 | > 210 | > 3.45 | |
| Connecticut | 654 | 7.06 | 17 | 2.61 | 32 | 3.62 | 119 | 7.19 | 486 | 8.0 | |
| Detroit | 748 | 8.08 | —‡ | — | 29 | 3.28 | > 80 | > 4.83 | 634 | 10.44 | |
| Hawaii | 141 | 1.52 | —‡ | — | —‡ | — | 30 | 1.81 | 91 | 1.5 | |
| Iowa | 773 | 8.35 | 140 | 21.51 | 119 | 13.46 | 117 | 7.07 | 397 | 6.54 | |
| New Mexico | 227 | 2.45 | 29 | 4.45 | 51 | 5.77 | 32 | 1.93 | 115 | 1.89 | |
| Seattle | 444 | 4.79 | 28 | 4.3 | > 15 | > 1.7 | —‡ | — | 395 | 6.51 | |
| Utah | 231 | 2.49 | 25 | 3.84 | 28 | 3.17 | 30 | 1.81 | 148 | 2.44 | |
| Atlanta and rural Georgia | 251 | 2.71 | 15 | 2.31 | 18 | 2.03 | 19 | 1.15 | > 195 | > 3.21 | |
| San Jose | 174 | 1.88 | —‡ | — | 15 | 1.7 | —‡ | — | 158 | 2.6 | |
| Los Angeles | 664 | 7.17 | —‡ | — | 28 | 3.17 | > 35 | > 2.11 | 590 | 9.72 | |
| Greater California | 1,415 | 15.28 | 79 | 12.14 | 169 | 19.12 | 346 | 20.91 | 821 | 13.52 | |
| Kentucky | 803 | 8.67 | 113 | 17.36 | 87 | 9.84 | 241 | 14.56 | 362 | 5.96 | |
| Louisiana | 703 | 7.59 | 118 | 18.13 | 87 | 9.84 | 78 | 4.71 | 420 | 6.92 | |
| New Jersey | 1,682 | 18.16 | 67 | 10.29 | 170 | 19.23 | 402 | 24.29 | 1,043 | 17.18 | |
*
Medicaid eligible before diagnosis and Medicaid eligible after diagnosis were combined for confidentiality reasons but were analyzed as separate groups.
†
Survival times of 6 months and 7-12 months were combined for confidentiality reasons but were analyzed as separate groups.
‡
To protect confidentiality, small cell sizes are suppressed.