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| Age (yr) | Questionnaire survey data No. (%) | KBCS registry data No. (%) |
|---|---|---|
| < 20 | 6 (0.03) | 2 (0.01) |
| 20-29 | 171 (1.0) | 124 (0.9) |
| 30-39 | 1,803 (10.2) | 1,229 (9.7) |
| 40-49 | 6,110 (34.5) | 4,532 (35.9) |
| 50-59 | 5,589 (31.5) | 4,041 (32.0) |
| 60-69 | 2,593 (14.6) | 1,812 (14.4) |
| 70-79 | 1,103 (6.2) | 786 (6.2) |
| ≥ 80 | 159 (0.9) | 99 (0.8) |
| Unknown | 300 (1.6) | 0 |
| Total | 17,734 (100.0) | 12,625 (100.0) |
KBCS=Korean Breast Cancer Society.
