Table 1.
Distribution of demographic and host characteristics by multiple primary (MPM) and single primary melanoma (SPM) status in GEM
| SPM (control) | MPM (case) | |
|---|---|---|
| Variables | n (%) or mean (SD) | n (%) or mean (SD) |
| Total Sample Size | N = 2151 | N = 1138 |
| Study Centre | ||
| British Columbia | 118 (5.5) | 39 (3.4) |
| California | 219 (10.2) | 89 (7.8) |
| New Jersey | 167(7.8) | 159 (14.0) |
| New South Wales | 725 (33.7) | 608 (53.4) |
| North Carolina | 285 (13.3) | 29 (2.6) |
| Ontario | 428 (19.9) | 134 (11.8) |
| Tasmania | 81 (3.8) | 63 (5.5) |
| Italy | 128 (6.0) | 17 (1.5) |
| Age (continuous) | 55.6 (15.9) | 65.2(13.2) |
| Sex | ||
| Male | 1115 (51.8) | 758(66.6) |
| Female | 1036 (48.2) | 380(33.4) |
| Freckles on face | ||
| None | 957 (44.5) | 463(40.7) |
| Few | 889 (41.3) | 514(45.2) |
| Many | 296 (13.8) | 156 (13.7) |
| Missing | 9 (0.4) | 5 (0.4) |
| Family History of Melanoma | ||
| No | 1836 85.4) | 861 (75.7) |
| Yes | 270 (12.6) | 249 (21.9) |
| Missing | 45 (2.1) | 28 (2.5) |
| Skin colour | ||
| Fair (Type 1or 2) | 1858 (86.4) | 1048 (92.1) |
| Dark (Types 3-6) | 292(13.6) | 88 ( 7.7) |
| 1 (0.5) | 2 (0.2) | |
| Eye colour | ||
| Dark Eyes (brown, black) | 409 (19.0) | 189 (16.6) |
| Light Eyes (blue, grey, green, hazel) | 1728 (80.3 | 947 (83.2) |
| Missing | 14 (0.7) | 2 (0.2) |
| Hair colour | ||
| Dark brown/black | 687 (31.9) | 297(26.1) |
| Light brown/blonde | 1261 (58.6) | 709 (62.3) |
| Red | 186 (8.7) | 129 (11.3) |
| Missing | 17 (0.8) | 3 (0.3) |
| Ability to tan | ||
| Deep tan | 363 (16.9) | 128 (11.3) |
| Moderate tan | 867 (40.3) | 456 (40.1) |
| Mild tan | 635 (29.5) | 349 (30.7) |
| No tan | 237(11.0) | 180 (15.8) |
| Missing | 49 (2.3) | 25 (2.2) |
| Number of nevi on back (counted) | ||
| 0 | 337(15.7) | 157 (13.8) |
| 1-10 | 918 (42.7) | 464 (40.8) |
| 11-25 | 554 (25.8) | 302 (26.5) |
| 26-50 | 142 (6.6) | 91(8.0) |
| 50+ | 161 (7.5) | 94 (8.3) |
| Missing | 39 (1.8) | 30 (2.6) |