Table 1.

Descriptive characteristics of study participants, Washington County, Maryland, 2007

Males (n = 2,701)Females (n = 4,157)P-value*
Age65.2 ± 12.063.0 ± 12.8<0.0001
    30-39 (%)2.04.3
    40-498.811.9
    50-5922.625.4
    60-6930.027.9
    70-7924.820.7
    >8011.89.8
Years of education13.7 ± 3.013.5 ± 2.70.10
Cigarette Smoking (% never)40.063.0<0.0001
BMI28.6 ± 5.128.5 ± 6.60.45
Use sunscreen often/always (%)13.229.0<0.0001
Wear sun-protective clothing often/always (%)27.016.9<0.0001
Skin reaction to sunlight (%)
    Blistering sunburn4.06.7<0.0001
    Sunburn without blisters28.534.0
    Mild sunburn that becomes a tan48.946.3
    Tan or darken with no sunburn16.710.8
    No change in skin color1.92.2
Complexion (%)
    Very fair1.85.2<0.0001
    Fair28.140.9
    Medium53.145.7
    Light brown7.33.6
    Medium/dark brown9.74.7
Facial freckling (%)
    None70.955.6<0.0001
    Small amount26.839.9
    Large amount/almost all2.34.5
Eye color (%)
    Blue or green46.444.40.10
    Other eye color53.755.6
≤1 day per week of 1 h sun exposure (%)23.649.0<0.0001
Blistering sunburn (% yes)59.861.30.19
Weekday h in the midday sun2.3 ± 1.71.3 ± 1.3<0.0001
Weekend h in the midday sun2.6 ± 1.61.6 ± 1.5<0.0001
Skin cancer (% yes)
    Personal history23.217.1<0.0001
    Family history24.931.2<0.0001
  • *t-test for continuous variables, χ2 test for categorical variables.

  • Percentages may not sum to exactly 100 due to rounding.