Table 1.
Characteristics of a case–control study of melanomas diagnosed at ages 0-29 in California (1988-2013). In this population-based study, cases were identified from California Cancer Registry records and controls were identified from California birth records.
| Melanoma |
||
|---|---|---|
| Cases (n=1,396) | Controls (n=27,920) | |
| Age in years, mean ± SD | 19 ± 6 | 19 ± 6 |
| Average Daily Ambient Ultraviolet Radiation (UV; watt hours/m2), mean ± SD | 5,007 ± 187 | 5,019 ± 189 |
| Age Category (years) | ||
| <5 | 52(4) | 1,040(4) |
| 5-9 | 57(4) | 1,140(4) |
| 10-14 | 137(10) | 2,740(10) |
| 15-19 | 391(28) | 7,820(28) |
| 20-24 | 557(40) | 11,140(40) |
| 25-29 | 202(14) | 4,040(14) |
| Sex, No. (%) | ||
| Female | 862 (62) | 13,492(48) |
| Male | 534 (38) | 14,429(52) |
| Socioeconomic status quintiles, No. (%) | ||
| Lowest | 183(13) | 6,408(23) |
| Lower Middle | 265(19) | 6,695(24) |
| Middle | 341(24) | 7,074(25) |
| Upper Middle | 283(20) | 4,248(15) |
| Highest | 323(23) | 3,426(12) |
| Missing | 1 | 70 |
| Race (Mother), No. (%) | ||
| White | 1,350(97) | 22,534(81) |
| Black | 8(1) | 2383(9) |
| Asian/Pacific Islander | 27(2) | 2623(9) |
| Other | 11(1) | 380(1) |
| Hispanicity (Mother), No. (%) | ||
| No | 1,276(91) | 17,846(64) |
| Yes | 102(7) | 9,790(35) |
| Unknown | 15(1) | 225(1) |
| Missing | 3 | 60 |
| Maternal Age (years), No. (%) | ||
| <20 | 62 (4) | 3,118(11) |
| 20-34 | 1,146(82) | 22,024(79) |
| ≥35 | 184(13) | 2,704(10) |
| Missing | 4 | 75 |
| Gestational Age (weeks), No. (%) | ||
| <33 | 11(1) | 547(2) |
| 33-36 | 75(6) | 2,078(8) |
| 37-42 | 1,169(88) | 22,204(85) |
| >42 | 72(5) | 1,431(5) |
| Missing | 69 | 1,661 |
| Birth Weight Category (grams, g), No. (%) | ||
| Low Birth Weight (LBW; <2500g) | 41(3) | 1,676(6) |
| Normal Birth Weight (2500-4000g) | 1,141(82) | 23,014(82) |
| High Birth Weight (HBW; >4000g) | 210(15) | 3,156(11) |
| Missing | 4 | 75 |
| Quartiles of UV, No. (%) | ||
| Q1 (UV = 3912-4946) | 349(25) | 6,967(25) |
| Q2 (UV > 4946 - 5036) | 348(25) | 7,015(25) |
| Q3 (UV > 5036 - 5121) | 364(26) | 6,953(25) |
| Q4 (UV = 5121-5752) | 334(24) | 6,921(25) |
| Missing | 1 | 65 |