Table 2.
Adjusted analysis of relative odds (95% CLs) of treatment for colorectal cancer starting >30 days of diagnosis by treatment type, stage and socioeconomic factors: South Australian major public hospitals, 2000–2010 diagnoses*
| Surgery (surgery cases) | Radiotherapy (radiotherapy cases) | Chemotherapy (chemotherapy cases) | Any treatment (surgery cases) | |||||
| N | RO (95% CLs) | n | RO (95% CLs) | n | RO (95% CLs) | n | RO (95% CLs) | |
| Age at diagnosis (years) | ||||||||
| <50 (ref.) | 91 | 1.00 | 79 | 1.00 | 189 | 1.00 | 91 | 1.00 |
| 50–59 | 210 | 1.15 (0.68 to 1.95) | 118 | 1.06 (0.52 to 2.15) | 322 | 1.18 (0.71 to 1.94) | 210 | 1.20 (0.70 to 2.05) |
| 60–69 | 388 | 1.16 (0.71 to 1.90) | 188 | 1.16 (0.60 to 2.25) | 498 | 1.25 (0.79 to 2.00) | 388 | 1.26 (0.76 to 2.08) |
| 70–79 | 570 | 0.95 (0.59 to 1.53) | 175 | 1.13 (0.58 to 2.22) | 469 | 1.51 (0.93 to 2.45) | 570 | 1.20 (0.73 to 1.95) |
| 80+ | 416 | 0.82 (0.50 to 1.34) | 56 | 1.09 (0.44 to 2.73) | 78 | 2.20 (0.95 to 5.10) | 416 | 1.04 (0.63 to 1.72) |
| Sex | ||||||||
| Male (ref.) | 893 | 1.00 | 400 | 1.00 | 910 | 1.00 | 893 | 1.00 |
| Female | 782 | 0.85 (0.69 to 1.05) | 216 | 0.72 (0.47 to 1.11) | 646 | 1.08 (0.80 to 1.47) | 782 | 0.88 (0.72 to 1.09) |
| Socioeconomic | ||||||||
| Low (ref.) | 544 | 1.00 | 206 | 1.00 | 507 | 1.00 | 544 | 1.00 |
| Low-medium | 388 | 1.17 (0.87 to 1.59) | 137 | 0.73 (0.40 to 1.33) | 374 | 0.92 (0.61 to 1.39) | 388 | 1.14 (0.84 to 1.54) |
| Medium-high | 345 | 1.06 (0.78 to 1.42) | 128 | 0.55 (0.30 to 1.01) | 320 | 0.89 (0.58 to 1.38) | 345 | 0.98 (0.73 to 1.32) |
| High | 398 | 1.05 (0.77 to 1.42) | 145 | 0.78 (0.42 to 1.46) | 355 | 0.94 (0.61 to 1.45) | 398 | 1.05 (0.77 to 1.42) |
| Accessibility | ||||||||
| High (ref.) | 1353 | 1.00 | 475 | 1.00 | 1223 | 1.00 | 1353 | 1.00 |
| Medium-high | 228 | 0.62 (0.36 to 1.08) | 94 | 1.28 (0.45 to 3.65) | 228 | 0.78 (0.30 to 2.00) | 228 | 0.75 (0.43 to 1.31) |
| Poor | 94 | 0.83 (0.45 to 1.52) | 47 | 1.14 (0.36 to 3.58) | 105 | 0.60 (0.23 to 1.57) | 94 | 0.89 (0.49 to 1.63) |
| Local health network | ||||||||
| Northern metro (ref.) | 242 | 1.00 | 106 | 1.00 | 248 | 1.00 | 242 | 1.00 |
| Central metro | 618 | 0.55 (0.39 to 0.76) | 202 | 0.90 (0.47 to 1.72) | 495 | 0.99 (0.62 to 1.57) | 618 | 0.56 (0.40 to 0.78) |
| Southern metro | 417 | 0.44 (0.31 to 0.63) | 134 | 0.68 (0.35 to 1.33) | 426 | 0.84 (0.52 to 1.35) | 417 | 0.44 (0.30 to 0.63) |
| Country South | 155 | 0.86 (0.51 to 1.43) | 74 | 0.52 (0.20 to 1.38) | 159 | 2.40 (0.90 to 6.39) | 155 | 0.78 (0.47 to 1.30) |
| Country North | 241 | 0.78 (0.43 to 1.43) | 100 | 1.60 (0.49 to 5.18) | 228 | 2.03 (0.76 to 5.39) | 241 | 0.73 (0.40 to 1.34) |
| Tumour site | ||||||||
| Colon (ref.) | 1098 | 1.00 | 86 | 1.00 | 898 | 1.00 | 1098 | 1.00 |
| Rectum (including rectosigmoid) | 577 | 2.07 (1.66 to 2.57) | 530 | 0.40 (0.19 to 0.83) | 658 | 0.65 (0.48 to 0.89) | 577 | 1.76 (1.41 to 2.19) |
| ACPS stage | ||||||||
| A (ref.) | 280 | 1.00 | 50 | 1.00 | 47 | 1.00 | 280 | 1.00 |
| B | 654 | 0.87 (0.64 to 1.17) | 147 | 1.03 (0.46 to 2.28) | 249 | 1.78 (0.81 to 3.90) | 654 | 0.80 (0.59 to 1.08) |
| C | 412 | 0.99 (0.72 to 1.37) | 231 | 1.56 (0.72 to 3.38) | 696 | 3.93 (1.85 to 8.36) | 412 | 0.89 (0.65 to 1.23) |
| D | 279 | 0.65 (0.45 to 0.93) | 162 | 0.71 (0.33 to 1.55) | 516 | 0.83 (0.40 to 1.71) | 279 | 0.56 (0.38 to 0.80) |
| UK | 50 | 0.67 (0.31 to 1.48) | 26 | 0.93 (0.28 to 3.06) | 48 | 0.84 (0.27 to 2.62) | 50 | 0.65 (0.33 to 1.25) |
| Grade | ||||||||
| Well diff. (ref.) | 58 | 1.00 | 25 | 1.00 | 37 | 1.00 | 58 | 1.00 |
| Mod diff. | 1212 | 0.68 (0.39 to 1.20) | 429 | 1.34 (0.50 to 3.58) | 1054 | 1.18 (0.43 to 3.22) | 1212 | 0.72 (0.42 to 1.25) |
| Poorly undiff. | 285 | 0.47 (0.25 to 0.87) | 99 | 0.87 (0.62 to 5.67) | 309 | 1.28 (0.45 to 3.68) | 285 | 0.52 (0.28 to 0.95) |
| UK | 120 | 1.48 (0.75 to 2.95) | 63 | 1.02 (0.33 to 3.12) | 156 | 0.41 (0.14 to 1.17) | 120 | 1.44 (0.74 to 2.81) |
| Diagnosis year | ||||||||
| 2000–2005 | 869 | 1.00 | 335 | 1.00 | 782 | 1.00 | 869 | 1.00 |
| 2006–2010 | 806 | 1.82 (1.48 to 2.24) | 281 | 1.48 (0.97 to 2.26) | 774 | 0.65 (0.48 to 0.89) | 806 | 1.86 (1.51 to 2.29) |
*Derived from multivariate logistic regression (see ‘Methods’).
ACPS, Australian Clinico-Pathological Staging; CLs, confidence limits; diff., differentiated; ref., reference; RO, relative odds; UK, unknown; undiff., undifferentiated.