Table 3. CT scan utilization by patient characteristicsa in patients surviving uncensored to end of surveillance period.
| 4-9 months N= 1214 |
10-15 months N= 741 |
16-21 months N= 558 |
22-27 months N= 452 |
|
|---|---|---|---|---|
| n (%)b | n (%)b | n (%)b | n (%)b | |
| Total | 831 (68.5) | 426 (57.5) | 241 (43.2) | 173 (38.3) |
| Age | ||||
| < 75 | 519 (74.1)§ | 252 (63.0)† | 146 (48.3)† | 98 (40.5) |
| ≥ 75 | 312 (60.7) | 174 (51.0) | 95 (37.1) | 75 (35.7) |
| Race | ||||
| White | 727 (69.4) | 374 (58.4) | 218 (45.0)* | 152 (38.8) |
| Nonwhite Year of diagnosis |
104 (62.6) | 52 (51.5) | 23 (31.1) | 21 (35.0) |
| 1992-1999 | 232 (57.3) § | 123 (46.8) § | 71 (36.6)* | 51 (32.5) |
| 2000-2005 | 599 (74.0) | 303 (63.4) | 170 (46.7) | 122 (41.4) |
| Income | ||||
| 1st quartile | 169 (63.8) | 92 (55.4) | 43 (36.1) | 33 (34.9) |
| 2nd quartile | 180 (68.7) | 103 (60.2) | 54 (42.5) | 34 (32.7) |
| 3rd quartile | 196 (70.5) | 95 (58.6) | 66 (52.8) | 44 (44.9) |
| 4th quartile | 248 (69.9) | 116 (57.1) | 63 (40.4) | 55 (43.3) |
| Tumor site | ||||
| Head | 610 (68.8)* | 302 (57.9) | 157 (42.0) | 117 (39.7) |
| Body/tail | 134 (73.6) | 68 (54.4) | 50 (46.3) | 31 (33.3) |
| Not specified | 87 (60.0) | 56 (59.6) | 34 (44.7) | 25 (39.1) |
| Node | ||||
| Positive | 397 (72.7)* | 165 (59.1) | 92 (47.4) | 55 (37.4) |
| Negative | 357 (65.5) | 212 (56.7) | 118 (40.4) | 96 (39.5) |
| Adjuvant therapy | ||||
| Any adjuvant | 503 (81.3) § | 216 (71.1) § | 112 (56.0) § | 65 (43.6) |
| Surgery only | 328 (55.1) | 210 (48.1) | 129 (36.0) | 108 (35.6) |
*
P<0.05
†
P<0.01
§
P<0.0001
Note: P values represent the statistical significance of differences between subcategories of patient characteristics within a particular surveillance period (e.g., < 75 vs. ≥ 75 in the 4-9 month surveillance period)
a
Other covariates showed no statistically significant differences, and are excluded from this table.
b
n(%) indicates the number and percent of patients within each subcategory of patient characteristics who had a CT scan during the surveillance period indicated in the column heading. The number and percent of patients within each subcategory who did not have a CT scan are not presented in the table, but may be estimated within each subcategory and surveillance period by subtracting the percentage from 100.