Table 4.
Association between site-specific sunburns and natural log-transformed nevus counts, controlling for sex, phenotype, and propensity to burn versus tan in children ages 7 to 8 y, Colorado (n = 743)
| Predictor (reference category) |
b value (P) |
||||
|---|---|---|---|---|---|
| Body | Face and neck | Back | Arms | Legs | |
| No. site-specific sunburns (0)* | |||||
| 1 | 0.136 (0.01) | 0.068 (0.25) | 0.101 (0.12) | 0.045 (0.64) | 0.034 (0.78) |
| 2 | 0.162 (0.008) | 0.008 (0.92) | 0.188 (0.08) | 0.093 (0.41) | |
| 3 | 0.185 (0.01) | 0.094 (0.33) | 0.312 (0.03) | ||
| 4 | 0.283 (0.002) | 0.137 (0.16) | |||
| 5 | 0.205 (0.02) | ||||
| Sex (female) | |||||
| Male | 0.068 (0.12) | 0.484 (<0.0001) | 0.264 (<0.0001) | −0.140 (0.02) | −0.244 (<0.0001) |
| Base skin color† | 0.011 (0.27) | −0.005 (0.69) | −0.006 (0.60) | 0.020 (0.14) | 0.035 (0.008) |
| Hair color (medium brown to black) | |||||
| Red | −0.849 (<0.0001) | −0.534 (<0.0001) | −0.813 (<0.0001) | −1.176 (<0.0001) | −0.586 (<0.0001) |
| Blond | −0.015 (0.80) | 0.020 (0.76) | 0.059 (0.40) | −0.124 (0.11) | 0.075 (0.31) |
| Light brown | 0.024 (0.64) | 0.111 (0.06) | 0.027 (0.67) | −0.016 (0.82) | 0.005 (0.94) |
| Eye color (brown) | |||||
| Blue/green | 0.144 (0.007) | 0.072 (0.23) | 0.162 (0.01) | 0.230 (0.001) | 0.142 (0.04) |
| Hazel | 0.104 (0.08) | 0.105 (0.12) | 0.140 (0.05) | 0.107 (0.17) | 0.089 (0.25) |
| Freckling on the face‡ | 0.054 (<0.0001) | −0.093 (<0.0001) | 0.047 (<0.0001) | 0.081 (<0.0001) | 0.115 (<0.0001) |
| Propensity to burn vs tan (none/good) | |||||
| Painful burn/no tan | 0.007 (0.94) | 0.036 (0.72) | 0.107 (0.32) | 0.033 (0.78) | 0.000 (0.99) |
| Painful burn/light tan | 0.028 (0.67) | −0.028 (0.71) | 0.082 (0.30) | 0.090 (0.29) | −0.007 (0.94) |
| Slight burn/little tan | 0.113 (0.04) | 0.016 (0.80) | 0.139 (0.04) | 0.147 (0.04) | 0.138 (0.05) |
| Degree of tan (b-dimension difference)§ | 0.036 (0.10) | 0.017 (0.49) | 0.048 (0.07) | 0.064 (0.03) | 0.017 (0.56) |
NOTE: Slopes (b values) and P values for each predictor of nevus counts on five body locations were obtained from multiple linear regression.
*
Reported at ages 4 to 5 and 5 to 6 y for the previous 12 mo for the specified body site. The highest burn category in each analysis includes subjects having the specified number of burns or greater on that site.
†
Measured by colorimeter, with L-dimension on the medial upper arm.
‡
By standardized, 10-level chart.
§
Measured by colorimeter, as the difference in b-dimension between medial upper arm and lateral forearm.