Table 1.
Frequency distribution of phenotypic factors and 2-y sunburn history by sex in children ages 7 to 8 y, Colorado (n = 743)
| Characteristic | Girls, % (n) | Boys, % (n) |
|---|---|---|
| Sex | 51.8 (385) | 48.2 (358) |
| Base skin color (tertiles of L-dimension)* | ||
| First (darkest) | 40.5 (156) | 25.1 (90) |
| Second (intermediate) | 36.1 (139) | 29.9 (107) |
| Third (lightest) | 23.4 (90) | 45.0 (161) |
| Hair color | ||
| Red | 4.2 (16) | 4.5 (16) |
| Blond | 19.5 (75) | 23.2 (83) |
| Light brown | 29.9 (115) | 20.4 (73) |
| Medium brown to black | 46.5 (179) | 52.0 (186) |
| Eye color | ||
| Blue/green | 48.1 (185) | 46.9 (168) |
| Brown | 29.1 (112) | 32.4 (116) |
| Hazel | 22.9 (88) | 20.7 (74) |
| Freckling on the face† | ||
| None | 31.2 (120) | 34.6 (124) |
| Some | 43.4 (167) | 37.7 (135) |
| Moderate | 20.3 (78) | 20.1 (72) |
| Heavy | 5.2 (20) | 7.5 (27) |
| Propensity to burn vs tan | ||
| Painful burn/no tan | 10.1 (39) | 8.9 (32) |
| Painful burn/light tan | 21.6 (83) | 25.4 (91) |
| Slight burn/little tan | 45.2 (174) | 47.5 (170) |
| No burn/good tan | 23.1 (89) | 18.2 (65) |
| Degree of tan (tertiles of b-dimension difference)‡ | ||
| First (least tan) | 43.1 (166) | 22.6 (81) |
| Second (intermediate) | 36.4 (140) | 30.2 (108) |
| Third (most tan) | 20.5 (79) | 47.2 (169) |
| No. sunburns anywhere on the body | ||
| None | 31.9 (123) | 29.6 (106) |
| 1 | 25.5 (98) | 26.8 (96) |
| 2 | 16.9 (65) | 20.7 (74) |
| 3 | 13.2 (51) | 9.8 (35) |
| 4 | 6.8 (26) | 5.9 (21) |
| 5+ | 5.7 (22) | 7.3 (26) |
| No. sunburns on the face | ||
| None | 54.3 (209) | 55.6 (199) |
| 1 | 20.0 (77) | 22.9 (82) |
| 2 | 11.2 (43) | 10.1 (36) |
| 3 | 7.8 (30) | 5.3 (19) |
| 4+ | 6.8 (26) | 6.1 (22) |
| No. sunburns on the back | ||
| None | 71.9 (277) | 72.3 (259) |
| 1 | 19.5 (75) | 17.3 (62) |
| 2 | 5.5 (21) | 7.0 (25) |
| 3+ | 3.1 (12) | 3.4 (12) |
| No. sunburns on the shoulders | ||
| None | 55.3 (213) | 58.4 (209) |
| 1 | 26.5 (102) | 24.0 (86) |
| 2 | 9.9 (38) | 10.9 (39) |
| 3+ | 8.3 (32) | 6.7 (24) |
| No. sunburns on the chest | ||
| None | 96.4 (371) | 97.5 (349) |
| 1+ | 3.6 (14) | 2.5 (9) |
| No. sunburns on the arms | ||
| None | 84.2 (324) | 85.2 (305) |
| 1 | 8.3 (32) | 9.8 (35) |
| 2+ | 7.5 (29) | 5.0 (18) |
| No. sunburns on the legs | ||
| None | 93.8 (361) | 96.1 (344) |
| 1+ | 6.2 (24) | 3.9 (14) |
| Intervention status | ||
| Intervention | 60.8 (234) | 60.6 (217) |
NOTE: Two-year sunburn history was reported at ages 4 to 5 and 5 to 6 y for the previous 12 mo.
*
Measured by colorimeter, with L-dimension on the medial upper arm.
†
By standardized chart.
‡
Measured by colorimeter, as the difference in b-dimension between medial upper arm and lateral forearm.