Table 1.
Characteristics of study participants born in 1998 by year, 2001-2006, age 3-8 years, Colorado, United States
| Race/ethnicity of study sample | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Age 3, 2001 (n=281) |
Age 4, 2002 (n=137) |
Age 5, 2003 (n=284) |
Age 6, 2004 (n=856) |
Age 7, 2005 (n=870) |
Age 8, 2006 (n=860) |
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| n | % | n | % | n | % | n | % | n | % | n | % | |
| White, non-Hispanic | 232 | 83.8 | 121 | 89.6 | 229 | 81.8 | 720 | 84.6 | 733 | 84.5 | 728 | 84.8 |
| Hispanic white | 29 | 10.5 | 9 | 6.7 | 38 | 13.6 | 80 | 9.4 | 78 | 9.0 | 78 | 9.1 |
| Black | 6 | 2.2 | 1 | 0.7 | 6 | 2.1 | 21 | 2.5 | 24 | 2.8 | 22 | 2.6 |
| Asian/Pacific Islander | 9 | 3.2 | 4 | 3.0 | 5 | 1.8 | 26 | 3.1 | 27 | 3.1 | 24 | 2.8 |
| Native American | 1 | 0.4 | 0 | 0 | 2 | 0.7 | 4 | 0.5 | 5 | 0.6 | 6 | 0.7 |
| Other/missing | 4 | 2 | 4 | 5 | 3 | 2 | ||||||
| Characteristics of White, non-Hispanic study participants | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Age 3, 2001 (n=232) |
Age 4, 2002 (n=121) |
Age 5, 2003 (n=229) |
Age 6, 2004 (n=720) |
Age 7, 2005 (n=733) |
Age 8, 2006 (n=728) |
|||||||
| n | value | n | value | n | value | n | value | n | value | n | value | |
| Sex (%) | ||||||||||||
| Male | 115 | 49.6 | 54 | 44.6 | 107 | 46.7 | 350 | 48.6 | 346 | 47.2 | 338 | 46.4 |
| Female | 117 | 50.4 | 67 | 55.4 | 122 | 53.3 | 370 | 51.4 | 387 | 52.8 | 390 | 53.6 |
| Hair color (%) | ||||||||||||
| Blonde | 69 | 29.9 | 21 | 17.4 | 55 | 24.1 | 133 | 18.6 | 49 | 6.7 | 68 | 9.4 |
| Red | 11 | 4.8 | 7 | 5.8 | 7 | 3.1 | 27 | 3.8 | 25 | 3.4 | 34 | 4.7 |
| Light brown | 98 | 42.4 | 64 | 52.9 | 89 | 39.0 | 322 | 45.0 | 351 | 48.0 | 295 | 40.6 |
| Medium brown | 48 | 20.8 | 29 | 24.0 | 74 | 32.5 | 229 | 32.0 | 302 | 41.3 | 327 | 45.0 |
| Dark brown/black | 5 | 2.2 | 0 | 0 | 3 | 1.3 | 4 | 0.6 | 5 | 0.7 | 3 | 0.4 |
| Missing | 1 | 5 | 1 | 1 | ||||||||
| Eye color (%) | ||||||||||||
| Blue/green | 144 | 62.3 | 59 | 48.8 | 132 | 57.9 | 389 | 54.5 | 401 | 54.8 | 370 | 50.9 |
| Brown/black | 57 | 24.7 | 30 | 24.8 | 56 | 24.6 | 172 | 24.1 | 186 | 25.4 | 192 | 26.4 |
| Hazel | 30 | 13.0 | 32 | 26.4 | 40 | 17.5 | 153 | 21.4 | 145 | 19.8 | 165 | 22.7 |
| Missing | 1 | 1 | 1 | |||||||||
| Age 3, 2001 (n=232) |
Age 4, 2002 (n=121) |
Age 5, 2003 (n=229) |
Age 6, 2004 (n=720) |
Age 7, 2005 (n=733) |
Age 8, 2006 (n=728) |
|||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| n | value | n | value | n | value | n | value | n | value | n | Value | |
| Freckling (%) | ||||||||||||
| Face (any) | 38 | 16.7 | 37 | 30.6 | 91 | 39.7 | 349 | 49.4 | 446 | 60.9 | 509 | 69.9 |
| Arms (any) | 1 | 0.4 | 1 | 0.8 | 2 | 0.9 | 10 | 1.4 | 38 | 5.2 | 82 | 11.3 |
| Back (any) | 0 | 0 | 0 | 0 | 3 | 1.3 | 9 | 1.3 | 29 | 4.0 | 52 | 7.1 |
| Base skin color, b scale (mean) |
232 | 11.1 | 121 | 11.3 | 227 | 10.4 | 717 | 11.0 | 732 | 10.8 | 723 | 10.9 |
| Tanning score, b scale (mean) |
231 | 2.3 | 121 | 1.9 | 227 | 1.8 | 717 | 2.8 | 732 | 2.7 | 723 | 2.6 |
| Nevi | ||||||||||||
| Mean | 231 | 6.2 | 121 | 11.8 | 229 | 19.3 | 719 | 21.8 | 732 | 28.8 | 728 | 31.6 |
| Median | 231 | 6.0 | 121 | 11.0 | 229 | 17.0 | 719 | 19.0 | 732 | 25.0 | 728 | 29.0 |
| Range | 231 | 0-22 | 121 | 1-35 | 229 | 1-66 | 719 | 1-92 | 732 | 2-116 | 728 | 2-118 |
| Standard deviation | 231 | 4.1 | 121 | 6.5 | 229 | 11.4 | 719 | 13.6 | 732 | 17.4 | 728 | 18.4 |
| Interquartile range | 231 | 6.0 | 121 | 8.5 | 229 | 14.0 | 719 | 17.0 | 732 | 22.0 | 728 | 22.0 |
| Height (mean, inches) | 231 | 37.4 | 121 | 40.7 | 229 | 45.0 | 715 | 46.6 | 732 | 49.8 | 727 | 51.0 |
| Weight (mean, pounds) | 231 | 32.1 | 121 | 36.3 | 229 | 44.5 | 718 | 48.0 | 732 | 53.8 | 727 | 60.7 |
| Age at time of exam (range - months) |
231 | 33-41 | 121 | 45-53 | 229 | 61-75 | 719 | 69-81 | 732 | 81-93 | 727 | 93-105 |