Table 1.
Patient demographics and screening history by case-control status.
| Controls (n = 15,202) | Cases (n = 8288) | |
|---|---|---|
| Patient demographics | ||
| Breast cancer diagnosis and death | ||
| Year of first diagnosis/pseudodiagnosis (Count, %) | ||
| 1990–1994 | 505 (3.3) | 275 (3.3) |
| 1995–1999 | 1481 (9.7) | 792 (9.6) |
| 2000–2004 | 2988 (19.7) | 1630 (19.7) |
| 2005–2011 | 10,228 (67.3) | 5591 (67.5) |
| Age at first diagnosis/pseudodiagnosis (Count, %) | ||
| 47–54 | 2328 (15.3) | 1241 (15.0) |
| 55–59 | 2772 (18.2) | 1493 (18.0) |
| 60–64 | 2783 (18.3) | 1530 (18.5) |
| 65–69 | 2343 (15.4) | 1303 (15.7) |
| 70–74 | 2238 (14.7) | 1222 (14.7) |
| 75–89 | 2738 (18.0) | 1499 (18.1) |
| Median age at first diagnosis/pseudodiagnosis in years (range) | 64.4 (48.0–86.5) | 64.6 (48.0–86.5) |
| Median age at death in years (range) | – | 70.8 (49.6–88.4) |
| Patient screening history | ||
| Breast screening history | ||
| Number of screening invitations (Count, %) | ||
| 1 | 3700 (24.3) | 2012 (24.3) |
| 2 | 3486 (22.9) | 1863 (22.5) |
| 3 | 2859 (18.8) | 1585 (19.1) |
| 4 | 2257 (14.8) | 1238 (14.9) |
| 5+ | 2900 (19.1) | 1590 (19.2) |
| Median age at first screening invitation in years (range) | 523 (47.1–70.0) | 52.5 (47.0–69.8) |
| Attendance at first screening invitation | ||
| Did not attend | 2772 (18.2) | 2345 (28.3) |
| Attended | 12,430 (81.8) | 5943 (71.7) |
| Median age at last screening invitation in years (range) | 61.8 (47.2–73.1) | 61.9 (47.0–72.7) |
| Attendance at last screening invitation | ||
| Did not attend | 3583 (23.6) | 2980 (36.0) |
| Attended | 11,619 (76.4) | 5308 (64.0) |
| Number of screens (Count, %) | ||
| 0 (Never screened) | 1803 (11.9) | 1741 (21.0) |
| 1 | 3923 (25.8) | 2117 (25.5) |
| 2+ | 9476 (62.3) | 4430 (53.5) |
| Median time between last screen and diagnosis/pseudodiagnosis (range)—among compliers | 2.4 years (1 day–22.6 years) | 2.7 years (0–22.2 years) |
| Median age at first screen in years (range)—among compliers | 53.1 (47.1–72.1) | 53.6 (47.2–70.6) |
| Median age at last screen in years (range)—among compliers | 61.7 (47.3–73.2) | 61.5 (47.3–72.8) |
| Cervical screening history | ||
| Attendance at cervical screening (Count, %) | ||
| Never screened | 2818 (18.5) | 1850 (22.3) |
| Screened | 12,384 (81.5) | 6438 (77.7) |