| Stage of Melanoma at Diagnosis | |||||
| Stage IIIB | Stage IIIC | Stage M1a | Stage M1b | Stage M1c | |
| N = 550 | N = 291 | N = 147 | N = 112 | N = 163 | |
| Age, mean (SD) | 75.6 (9.3) | 73.6 (10.6) | 75.9 (8.9) | 75.9 (7.5) | 74.3 (7.4) |
| Median | 76 | 75 | 76 | 76 | 74 |
| Male | 64.5% | 63.2% | 63.9% | 67.9% | 64.5% |
| White | 92.7% | 90.0% | 90.5% | 99.1% | 92.6% |
| Mean follow-up in Medicare in months (SD) | 43.6 (22.4) | 35.6 (21.8) | 36.3 (21.5) | 31.6 (21.4) | 25.5 (20.6) |
| Median | 41.5 | 29 | 30 | 24.5 | 19 |
| Enrolled in a health maintenance organization (HMO) | 32.0% | 26.5% | 36.7% | 36.6% | 29.4% |
| Year of melanoma diagnosis | |||||
| 2004 | 17.1% | 16.2% | 13.6% | 11.6% | 20.9% |
| 2005 | 18.4% | 19.9% | 22.4% | 19.6% | 14.1% |
| 2006 | 20.7% | 18.2% | 15.6% | 13.4% | 18.4% |
| 2007 | 19.1% | 17.2% | 17.7% | 24.1% | 19.6% |
| 2008 | 21.3% | 23.4% | 23.1% | 20.5% | 20.9% |
| 2009 | 3.5% | 5.2% | 7.5% | 10.7% | 6.1% |
| Evidence of prior cancer in SEER data | 38.0% | 31.3% | 40.1% | 50.9% | 48.5% |