Table 2. Factors associated with receipt of preoperative breast MRI.
| MRI | No MRI | Crude | Adjusted OR (95% CI) |
Adjusted P-value | ||||
|---|---|---|---|---|---|---|---|---|
| N | % | N | % | P-value | ||||
| Total | 7,333 | 10.1% | 65,128 | 89.9% | ||||
| Age group | ||||||||
| 67-69 | 1,864 | 15.8% | 9,926 | 84.2% | <.001 | Reference | <.001 | |
| 70-74 | 2,506 | 12.8% | 17,057 | 87.2% | 0.82 (0.76-0.88) | |||
| 75-79 | 1,706 | 9.1% | 16,989 | 90.9% | 0.59 (0.55-0.64) | |||
| 80-84 | 898 | 6.6% | 12,661 | 93.4% | 0.40 (0.36-0.44) | |||
| 85+ | 359 | 4.1% | 8,495 | 95.9% | 0.25 (0.22-0.29) | |||
| Race | ||||||||
| White | 6,764 | 10.4% | 58,426 | 89.6% | <.001 | Reference | .001 | |
| Black | 279 | 6.1% | 4,317 | 93.9% | 0.79 (0.69-0.91) | |||
| Other | 290 | 10.8% | 2,385 | 89.2% | 0.87 (0.75-1.00) | |||
| Marital Status | ||||||||
| Married | 3,877 | 12.5% | 27,106 | 87.5% | <.001 | Reference | <.001 | |
| Unmarried | 3,148 | 8.1% | 35,540 | 91.9% | 0.85 (0.80-0.90) | |||
| Other | 308 | 11.0% | 2,482 | 89.0% | 1.14 (0.99-1.31) | |||
| Median income of zip code | ||||||||
| Less than $33,000 | 826 | 5.6% | 14,024 | 94.4% | <.001 | Reference | <.001 | |
| $33,000-40,000 | 779 | 7.1% | 10,146 | 92.9% | 1.21 (1.08-1.35) | |||
| $40,000-50,000 | 1,387 | 9.2% | 13,703 | 90.8% | 1.48 (1.34-1.63) | |||
| $50,000-63,000 | 1,587 | 11.3% | 12,515 | 88.7% | 1.79 (1.62-1.98) | |||
| More than $63,000* | >2,743 | >15.7% | <14,721 | <84.3% | 2.68 (2.43-2.96) | |||
| Unknown* | <11 | <36.7% | >19 | >63.3% | 2.88(0.74-11.23) | |||
| Comorbidity | ||||||||
| None | 3,900 | 11.7% | 29,562 | 88.3% | <.001 | Reference | <.001 | |
| 1 to 2 | 2,739 | 9.8% | 25,112 | 90.2% | 0.84 (0.79-0.89) | |||
| 3 or more | 694 | 6.2% | 10,454 | 93.8% | 0.54 (0.49-0.59) | |||
| Stage | ||||||||
| I | 4,160 | 10.2% | 36,471 | 89.8% | .17 | Reference | <.001 | |
| II | 2,503 | 9.8% | 22,924 | 90.2% | 1.25 (1.11-1.40) | |||
| III | 670 | 10.5% | 5,733 | 89.5% | 1.00 (0.81-1.24) | |||
| Tumor size | ||||||||
| <2.0 cm | 4,729 | 10.7% | 39,347 | 89.3% | <.001 | Reference | <.001 | |
| 2.0-<=5.0 cm | 2,186 | 9.1% | 21,947 | 90.9% | 0.87 (0.79-0.95) | |||
| >5.0 cm | 353 | 9.6% | 3,316 | 90.4% | 1.12 (0.95-1.32) | |||
| Missing | 65 | 11.1% | 518 | 88.9% | 1.41 (1.03-1.91) | |||
| Grade | ||||||||
| Well differentiated | 1,894 | 11.0% | 15,361 | 89.0% | <.001 | Reference | <.001 | |
| Moderately differentiated | 3,403 | 10.9% | 27,692 | 89.1% | 1.03 (0.96-1.10) | |||
| Poorly differentiated | 1,625 | 8.8% | 16,936 | 91.2% | 0.82 (0.76-0.90) | |||
| Undifferentiated | 38 | 5.3% | 678 | 94.7% | 0.78 (0.54-1.11) | |||
| Unknown | 373 | 7.7% | 4,461 | 92.3% | 1.13 (0.99-1.28) | |||
| Number positive lymph nodes | ||||||||
| No positive nodes | 5,096 | 11.2% | 40,583 | 88.8% | <.001 | Reference | <.001 | |
| 1-3 positive nodes | 1,355 | 10.9% | 11,021 | 89.1% | 1.01 (0.92-1.12) | |||
| 4+ positive modes | 549 | 9.6% | 5,164 | 90.4% | 1.18 (0.98-1.42) | |||
| No nodes Examined | 304 | 3.6% | 8,070 | 96.4% | 0.52 (0.45-0.59) | |||
| Unknown # Positive Nodes | 29 | 9.1% | 290 | 90.9% | 1.15 (0.74-1.77) | |||
| Hormone receptors | ||||||||
| ER+ or PR+ | 6,121 | 10.9% | 49,993 | 89.1% | <.001 | Reference | .002 | |
| ER– and PR– | 900 | 9.9% | 8,163 | 90.1% | 1.02 (0.93-1.11) | |||
| Missing | 312 | 4.3% | 6,972 | 95.7% | 0.80 (0.70-0.91) | |||
| Bilateral Breast Cancer | ||||||||
| Yes (bilateral) | 443 | 22.7% | 1,508 | 77.3% | <.001 | Not Included | ||
| No (unilateral) | 6,890 | 9.8% | 63,620 | 90.2% | ||||
*
Values expressed as a range to conform to SEER-Medicare policy of not publishing cell sizes <11. Odds ratios adjusted for all variables in table as well as year of diagnosis and SEER region.