Table 1.
Characteristics of the Study Population of Subjects with Cutaneous Melanoma, 1988–1999, 11 Surveillance, Epidemiology and End Results Areas in the United States
| Overall Sample (N = 23,068) | Subjects Residing in Areas with Annual Income ≤$30,000 (n = 5,442) | Subjects Residing in Areas with Annual Income >$30,000 (n = 17,108) | |
|---|---|---|---|
| Characteristic | n (%) | ||
| Age | * | ||
| 65–69 | 6,954 (28.0) | 1,376 (25.3) | 4,935 (28.8) |
| 70–74 | 6,191 (26.8) | 1,357 (24.9) | 4,686 (27.4) |
| 75–79 | 4,896 (21.0) | 1,114 (20.5) | 3,627 (21.2) |
| ≥80 | 5,577 (24.2) | 1,595 (29.3) | 3,860 (22.6) |
| Sex | * | ||
| Male | 13,843 (60.0) | 3,018 (55.5) | 10,494 (61.3) |
| Female | 9,225 (40.0) | 2,424 (44.5) | 6,614 (38.7) |
| Marital status | * | ||
| Married | 11,817 (51.2) | 2,504 (46.0) | 9,105 (53.2) |
| Unmarried | 5,905 (25.6) | 1725 (31.7) | 4,070 (23.8) |
| Unknown | 5,346 (23.2) | 1213 (22.3) | 3,933 (23.0) |
| Race/ethnicity | * | ||
| White | 22,227 (96.3) | 5,128 (94.2) | 16,620 (97.1) |
| Black | 148 (0.6) | 88 (1.7) | 59 (0.3) |
| Hispanic | 459 (2.0) | 175 (3.2) | 266 (1.5) |
| Chinese | 36 (0.2) | 7 (0.1) | 26 (0.2) |
| Japanese | 75 (0.3) | 18 (0.3) | 51 (0.3) |
| Filipino | 36 (0.2) | 8 (0.2) | 24 (0.1) |
| Hawaiian | 15 (0.1) | 0 (0.0) | 11 (0.1) |
| American Indian | 17 (0.1) | 7 (0.1) | 9 (0.1) |
| Other | 55 (0.2) | 11 (0.2) | 42 (0.3) |
| Period | * | ||
| 1988–1993 | 9,621 (41.7) | 2,425 (55.4) | 6,972 (40.7) |
| 1994–1999 | 13,447 (58.3) | 3,017 (44.6) | 10,136 (59.3) |
| Stage at diagnosis | * | ||
| In situ | 7,570 (32.8) | 1,714 (31.5) | 5,677 (33.2) |
| Localized | 10,543 (45.7) | 2,506 (46.0) | 7,821 (45.7) |
| Regional | 1,966 (8.5) | 546 (10.0) | 1,383 (8.1) |
| Distant | 675 (3.0) | 216 (4.0) | 450 (2.6) |
| Unknown or unstaged | 2,314 (10.0) | 460 (8.5) | 1,777 (10.4) |
| Tumor thickness, mm (Breslow depth) | * | ||
| ≤1.00 | 7,082 (30.7) | 1,599 (29.4) | 5,139 (30.0) |
| 1.01–2.00 | 2,042 (8.8) | 526 (9.7) | 1,482 (8.7) |
| 2.01–4.00 | 1,511 (6.6) | 427 (7.8) | 1,062 (6.2) |
| >4.00 | 898 (3.9) | 268 (4.9) | 609 (3.6) |
| Unknown or unmeasured | 11,535 (50.0) | 2,622 (48.2) | 8,816 (51.3) |
| Histology | * | ||
| Nodular | 1,647 (7.1) | 447 (8.2) | 1,169 (6.8) |
| Lentigo maligna | 7,003 (30.4) | 1,662 (30.6) | 5,168 (30.2) |
| Superficial spreading | 4,982 (21.6) | 1,142 (21.0) | 3,758 (22.0) |
| Acral lentiginous | 316 (1.4) | 105 (1.9) | 205 (1.2) |
| Other | 9,120 (39.5) | 2,086 (38.3) | 6,808 (39.8) |
| Site | * | ||
| Trunk | 5,262 (22.8) | 1,032 (18.9) | 4,114 (24.0) |
| Face | 8,640 (37.4) | 2,230 (41.0) | 6,205 (36.3) |
| Upper limb | 5,121 (22.2) | 1,186 (21.8) | 3,821 (22.3) |
| Lower limb | 3,063 (13.3) | 739 (13.6) | 2,272 (13.3) |
| Nonspecified | 982 (4.3) | 255 (4.7) | 696 (4.1) |
| Comorbidities | * | ||
| 0 | 18,944 (82.1) | 4,303 (79.1) | 14,218 (83.1) |
| 1 | 2,705 (11.7) | 712 (13.1) | 1,932 (11.3) |
| ≥2 | 1,419 (6.2) | 427 (7.8) | 958 (5.6) |
Note: Data on income were missing for 518 subjects; data from U.S. Census 1990.
*
P<.001 (calculated using Pearson chi-square comparing ≤$30,000 with >$30,000).