TABLE 1.
Subject Demographics and Percent of Patients Receiving Breast MRI
| Variable | Total n = 46,824 | Received MRI n = 3241 (% of total)* |
|---|---|---|
| Age (mean) | 76.4 | 73.1 (6.9) |
| Year | ||
| 2003 | 15,729 | 607 (3.9) |
| 2004 | 15,777 | 1094 (6.9) |
| 2005 | 15,318 | 1540 (10.1) |
| Race | ||
| White | 39,672 | 2832 (7.1) |
| Black | 3383 | 133 (3.9) |
| Hispanic | 1836 | 152 (8.3) |
| Asian/Pacific Isl. | 1589 | 92 (5.8) |
| Other/unknown | 344 | 32 (9.3) |
| SEER urban/rural | ||
| Big metro | 26,835 | 2289 (8.5) |
| Metro | 13,320 | 732 (5.5) |
| Urban | 2744 | 109 (4.0) |
| Less urban | 3259 | 95 (2.9) |
| Rural | 666 | 16 (2.4) |
| Poverty level† (n = 43,958) | ||
| 1st Quartile ($$$) | 10,973 | 1048 (9.6) |
| 2nd Quartile | 11,002 | 856 (7.8) |
| 3rd Quartile | 10,985 | 712 (6.5) |
| 4th Quartile ($) | 10,998 | 436 (4.0) |
| Education level† (43,962) | ||
| 1st Quartile (highest) | 10,876 | 1182 (10.9) |
| 2nd Quartile | 11,043 | 798 (7.2) |
| 3rd Quartile | 11,070 | 655 (5.9) |
| 4th Quartile (lowest) | 10,973 | 418 (3.8) |
| Stage | ||
| 0/in situ | 7,694 | 496 (6.5) |
| I | 19,019 | 1318 (6.9) |
| II | 11,556 | 887 (7.7) |
| III | 3361 | 295 (7.2) |
| IV | 2137 | 82 (3.8) |
| Unknown | 3057 | 163 (6.9) |
| Surgery type | ||
| None | 4,036 | 184 (4.6) |
| Breast conservation | 26,005 | 1901 (7.3) |
| Mastectomy | 16,444 | 1139 (6.9) |
| Unknown/missing | 339 | 17 (5.0) |
| Tumor size | ||
| 0/micro | 3133 | 151 (4.8) |
| 0–2 | 26,495 | 1886 (7.1) |
| 2–5 | 11,173 | 775 (6.9) |
| >5 | 2724 | 221 (8.1) |
| Unknown | 3299 | 208 (7.1) |
[Source: SEER-Medicare data 2003–2005].
*
Determined by χ2 test for categorical and student’s t-test for continuous variables (P < 0.01 for all analyses).
†
Grouped in quartiles by author.