Table 1.
Characteristics of Provincial Cohorts of Breast Cancer Survivors
| Variable | BC | MB | ON | NS |
|---|---|---|---|---|
| Overall N | 9338 | 2688 | 23,700 | 2735 |
| Diagnosis years | 2007–2010 | 2007–2012 | 2007–2012 | 2007–2012 |
| Follow-up Time (N,%) | ||||
| Median (Inter-quartile range) | 4 (3–4) | 4 (3–4) | 5 (5–5) | 2 (2–4) |
| Full follow-up in Year 2 | 9338 (100.0) | 2688 (100.0) | 23,700 (100.0) | 2735 (100.0) |
| Full follow-up in Year 3 | 8862 (94.9) | 2583 (96.1) | 22,297 (94.1) | 2064 (75.5) |
| Full follow-up in Year 4 | 6213 (66.5) | 2037 (75.8) | 21,148 (89.2) | 1726 (63.1) |
| Full follow-up in Year 5 | 3865 (41.4) | 1516 (56.4) | 17,255 (72.8) | 892 (32.6) |
| Age at Diagnosis, years | ||||
| Median(Inter-quartile range) | 60(51–70) | 61(51–70) | 60 (50–69) | 61 (51–70) |
| Stage at Diagnosis (N,%) | ||||
| I | 4244 (44.7) | 1268 (47.2) | 10,036 (42.3) |
1366 (50.0) |
| II | 3150 (33.2) | 1086 (40.4) | 8602 (36.3) | 1010 (36.9) |
| III | 1089 (11.5) | 317 (11.8) | 2660 (11.2) | 315 (11.5) |
| IV | 182 (2.0) | 7 (0.3) | 88 (0.4) | 23 (0.8) |
| Unknown | 828 (8.7) | 10 (0.4) | 2314 (9.8) | 21 (0.8) |
| Initial Treatment (N,%) | ||||
| Lumpectomy | ||||
| Yes | 4890 (51.5) | 1948 (72.5) | 17,275 (72.9) | 1970 (72.0) |
| No | 4603 (48.5) | 740 (27.5) | 6425 (27.1) | 765 (28.0) |
| Mastectomy | ||||
| Yes | 3535 (37.2) | 910 (33.9) | 8293 (35.0) | 1360 (49.7) |
| No | 5958 (62.8) | 1778 (66.1) | 15,407 (65.0) | 1375 (50.3) |
| Chemotherapy | ||||
| Yes | 3391 (35.7) | 1244 (46.3) | 10,884 (45.9) | 1151 (42.1) |
| No | 4724 (49.8) | 1444 (53.7) | 12,816 (54.1) | 1584 (57.9) |
| Unknown | 1378 (14.5) | 0 | 0 | 0 |
| Radiotherapy | ||||
| Yes | 6079 (64.0) | 1550 (57.7) | 15,318 (64.6) | 1559 (57.0) |
| No | 3414 (36.0) | 1138 (42.3) | 8382 (35.4) | 1176 (43.0) |
| Baseline Continuity of Care (N,%) | ||||
| 0 visit | 701 (7.4) | 133 (5.0) | 1448 (6.1) | 93 (3.4) |
| 1–2 visits | 1175 (12.4) | 229 (8.5) | 2514 (10.6) | 333 (12.2) |
| UPC < =0.75(Low) | 3605 (38.0) | 1046 (38.9) | 6414 (27.1) | 703 25.7) |
| UPC > 0.75(High) | 4012 (42.3) | 1280 (47.6) | 13,324 (56.2) | 1606 (58.7) |
| Survivorship PCP continuity of care (N,%) | ||||
| 0 visit | 395 (4.2) | 84 (3.3) | 624 (2.8) | 115 (4.2) |
| 1–2 visits | 926 (9.8) | 145 (5.6) | 1470 (6.6) | 413 (15.1) |
| UPC < =0.75(Low) | 3289 (34.7) | 883 (34.2) | 7513 (33.7) | 589 (21.5) |
| UPC > 0.75(High) | 4883 (51.4) | 1471 (57.0) | 12,690 (56.9) | 1618 (59.2) |
| Survivorship Medical Oncologist continuity of care (N,%) | ||||
| 0 visit | 5494 (57.8) | 923 (35.7) | 4603 (20.6) | 829 (30.3) |
| 1–2 visits | 1468 (15.5) | 621 (24.0) | 5066 (22.7) | 1250 (45.7) |
| UPC < =0.75(Low) | 945 (10.0) | 345 (13.4) | 3960 (17.8) | 71 (2.6) |
| UPC > 0.75(High) | 1592 (16.8) | 694 (26.9) | 8668 (38.9) | 585 (21.4) |
PCP Primary Care Provider
UPC Usual Provider Continuity index