Table 1.
Characteristics of 524,860 screening mammograms by comorbidity score in the Breast Cancer Surveillance Consortium, 1999–2010
| Charlson Comorbidity Score[17] | ||||
|---|---|---|---|---|
| Overall | 0 | 1 | 2+ | |
| Characteristics at screen | N (column %) * | N (column %) * | N (column %) * | N (column %) * |
| Total N | 524860 | 379958 | 105889 | 39013 |
| Age in years (median, interquartile range) | 73 (69, 78) | 73 (69, 78) | 74 (70, 78) | 75 (70, 80) |
| Age group, years, N (%) | ||||
| 66–74 | 304334 (58.0) | 227031 (59.8) | 58292 (55.1) | 19011 (48.7) |
| 75–84 | 190180 (36.2) | 132603 (34.9) | 40916 (38.6) | 16661 (42.7) |
| 85–94 | 30346 (5.8) | 20324 (5.3) | 6681 (6.3) | 3341 (8.6) |
| Race/ethnicity, N (%) | ||||
| White | 421162 (86.0) | 313459 (88.2) | 79580 (81.0) | 28123 (78.5) |
| Black | 41000 (8.4) | 22950 (6.5) | 12528 (12.8) | 5522 (15.4) |
| Hispanic | 6539 (1.3) | 4590 (1.3) | 1360 (1.4) | 589 (1.6) |
| Asian/Pacific Islander | 15043 (3.1) | 10588 (3.0) | 3361 (3.4) | 1094 (3.1) |
| Other | 5735 (1.2) | 3853 (1.1) | 1363 (1.4) | 519 (1.4) |
| Missing | 35381 (6.7) | 24518 (6.5) | 7697 (7.3) | 3166 (8.1) |
| Education, N (%) | ||||
| <High School Graduate | 63112 (14.4) | 38672 (12.2) | 17137 (19.5) | 7303 (22.8) |
| High School Graduate or GED | 150575 (34.4) | 106433 (33.5) | 32420 (36.9) | 11722 (36.6) |
| Some College or Technical School | 111872 (25.5) | 83405 (26.2) | 21126 (24.0) | 7341 (22.9) |
| College Graduate | 112320 (25.7) | 89470 (28.1) | 17228 (19.6) | 5622 (17.6) |
| Missing | 86981 (16.6) | 61978 (16.3) | 17978 (17.0) | 7025 (18.0) |
| Median income, N (%) | ||||
| ≤$36,000 | 46834 (13.4) | 30874 (12.1) | 11640 (16.7) | 4320 (17.2) |
| $36,001–$47,500 | 74861 (21.3) | 52562 (20.5) | 16254 (23.3) | 6045 (24.1) |
| $47,501–$64,600 | 106064 (30.2) | 77925 (30.5) | 21116 (30.3) | 7023 (28.0) |
| ≥$64,601 | 122883 (35.0) | 94435 (36.9) | 20717 (29.7) | 7731 (30.8) |
| Missing | 174218 (33.2) | 124162 (32.7) | 36162 (34.2) | 13894 (35.6) |
| Rurality, N (%) | ||||
| Urban focused | 288631 (56.3) | 211534 (57.0) | 55397 (53.4) | 21700 (56.9) |
| Large rural | 108877 (21.2) | 77265 (20.8) | 23542 (22.7) | 8070 (21.2) |
| Small rural | 62912 (12.3) | 44709 (12.1) | 13670 (13.2) | 4533 (11.9) |
| Isolated rural | 52222 (10.2) | 37382 (10.1) | 11036 (10.6) | 3804 (10.0) |
| Missing | 12218 (2.3) | 9068 (2.4) | 2244 (2.1) | 906 (2.3) |
| Body mass index, kg/m2, N (%) | ||||
| <25 | 94358 (43.5) | 75180 (46.7) | 14536 (35.8) | 4642 (30.6) |
| 25 to <30 | 72722 (33.6) | 54621 (33.9) | 13400 (33.0) | 4701 (31.0) |
| 30 to <35 | 33537 (15.5) | 22219 (13.8) | 7888 (19.5) | 3430 (22.6) |
| ≥35 | 16125 (7.4) | 8986 (5.6) | 4723 (11.6) | 2416 (15.9) |
| Missing | 308118 (58.7) | 218952 (57.6) | 65342 (61.7) | 23824 (61.1) |
| Breast density, N (%) | ||||
| Almost entirely fat | 50895 (11.0) | 34707 (10.4) | 11627 (12.3) | 4561 (13.0) |
| Scattered fibroglandular densities | 246465 (53.1) | 175343 (52.4) | 51939 (54.9) | 19183 (54.8) |
| Heterogeneously dense | 151412 (32.6) | 112683 (33.7) | 28350 (30.0) | 10379 (29.7) |
| Extremely dense | 15283 (3.3) | 11765 (3.5) | 2639 (2.8) | 879 (2.5) |
| Missing | 60805 (11.6) | 45460 (12.0) | 11334 (10.7) | 4011 (10.3) |
| First-degree family history of breast cancer, N (%) | ||||
| No | 382400 (81.2) | 275717 (81.2) | 77840 (81.7) | 28843 (80.8) |
| Yes | 88283 (18.8) | 63979 (18.8) | 17463 (18.3) | 6841 (19.2) |
| Missing | 54177 (10.3) | 40262 (10.6) | 10586 (10.0) | 3329 (8.5) |
| Time since prior mammogram, N (%) | ||||
| No prior | 4756 (0.9) | 3189 (0.9) | 1057 (1.0) | 510 (1.3) |
| <1 year | 5203 (1.0) | 3727 (1.0) | 1037 (1.0) | 439 (1.2) |
| 1–2 years | 469791 (91.8) | 342514 (92.3) | 93897 (91.0) | 33380 (88.3) |
| ≥3 years | 32166 (6.3) | 21500 (5.8) | 7179 (7.0) | 3487 (9.2) |
| Missing | 12944 (2.5) | 9028 (2.4) | 2719 (2.6) | 1197 (3.1) |
| History of breast biopsy or aspiration, N (%) | ||||
| No | 383250 (74.1) | 276785 (73.9) | 77922 (74.7) | 28543 (74.6) |
| Yes | 134000 (25.9) | 97916 (26.1) | 26378 (25.3) | 9706 (25.4) |
| Missing | 7610 (1.4) | 5257 (1.4) | 1589 (1.5) | 764 (2.0) |
*
Column percentages based on non-missing values (except percentages shown for missing data)