Table 1. Characteristics of melanoma cases and controls in the NHS and HPFS.
| NHS and HPFS | |||
|---|---|---|---|
| All N = 6122 | Cases N = 494 | Controls N = 5628 | |
| Male (n,%) | 2428 (39.66) | 177 (35.83) | 2251 (40.00) |
| Female (n,%) | 3694 (60.34) | 317 (64.17) | 3377 (60.00) |
| Age (mean ± SD) | 43.46 ± 7.69 | 43.12 ± 7.86 | 43.49 ± 7.67 |
| Family history of melanoma (%) | 7.53 | 17.2 | 6.68 |
| Smoking Variables | |||
| Smoking status | |||
| Never (n,%) | 2628 (47.17) | 224 (47.36) | 2404 (47.16) |
| Past smoker (n,%) | 2351 (42.20) | 214 (45.24) | 2137 (41.92) |
| Current smoker (n,%) | 592 (10.63) | 35 (7.40) | 557 (10.93) |
| Ever Smoker (n,%) | 2943 (52.83) | 249 (52.64) | 2694 (52.85) |
| Duration of Smoking | |||
| Never (n,%) | 2628 (48.19) | 224 (48.07) | 2404 (48.21) |
| < 20 years (n,%) | 1316 (24.13) | 116 (24.89) | 1200 (24.06) |
| 20–29 years (n,%) | 536 (9.83) | 52 (11.16) | 484 (9.70) |
| 30+ years (n,%) | 973 (17.84) | 74 (15.88) | 899 (18.03) |
| Pack years for smokers (Mean ± SD) | 16.91 ± 19.25 | 15.47 ± 17.86 | 17.05 ± 19.38 |
| Cigarettes Smoked Per day in ever smokers | |||
| Never (n,%) | 2628 (47.17) | 224 (47.16) | 2404 (47.36) |
| 1–14 (n,%) | 1282 (23.01) | 119 (22.81) | 1163 (25.16) |
| 15 + (n,%) | 1661 (29.82) | 130 (30.03) | 1531 (27.48) |
| Yeas since quitting in past smokers | |||
| 10 + years (n,%) | 1773 (75.74) | 156 (72.90) | 1617 (76.02) |
| < 10 years (n,%) | 568 (24.26) | 58 (27.10) | 510 (23.98) |