Initial and confirmatory imaging for women with early-stage breast cancer treated with surgery in Ontario, 2007 to 2012
| Stage of disease | Initial imaging | Confirmatory imaging | Overall | ||
|---|---|---|---|---|---|
| Preoperative | Postoperative | Preoperative | Postoperative | ||
| Stage I (n = 13 724 patients) | |||||
| No. of tests/patient imaged,* mean ± SD | 3.2 ± 1.8 | ||||
| No. (%) of patients with stage I disease imaged | 7 768 (56.6) | 6 197 (45.2) | 1 461 (10.6) | 3 918 (28.5) | 10 921 (79.6) |
| No. (%) of stage I tests | 14 510 (41.1) | 12 911 (36.6) | 1 885 (5.3) | 5 967 (16.9) | 35 273 (100.0) |
| Stage II (n = 12 823 patients) | |||||
| No. of tests/patient imaged,* mean ± SD | 4.0 ± 1.9 | ||||
| No. (%) of patients with stage II disease imaged | 7 951 (62.0) | 8 196 (63.9) | 1 632 (12.7) | 5 831 (45.5) | 11 882 (92.7) |
| No. (%) of stage II tests | 16 397 (34.2) | 19 647 (41.0) | 2 252 (4.7) | 9 680 (20.2) | 47 976 (100.0) |
| All stages (n = 26 547 patients) | |||||
| No. of tests/patient imaged,* mean ± SD | 3.6 ± 1.9 | ||||
| No. (%) of all patients imaged | 15 719 (59.2) | 14 393 (54.2) | 3 093 (11.7) | 9 749 (36.7) | 22 811 (85.9) |
| No. (%) of all tests | 30 907 (37.1) | 32 558 (39.1) | 4 137 (5.0) | 15 647 (18.8) | 83 249 (100.0) |
Note: SD = standard deviation.
↵* Means were calculated only for overall results.