Table 1: Individual characteristics of the students.

%

Total2163100

 Male107049.5
 Female109250.5

Nationality
 Greek189887.8
 Other26412.2

Distance of living from sea
 0–5 km157672,9
 10–15 km884,1
 15–20 km1557,2
20 km34415,9

You are
 moles-skinned and rarely get sunburns99946.2
 light-skinned and easily get sunburns116353.8

Your eye colour is
 dark162575.2
 light53724.8

Your hair colour is
 dark148368.6
 light67931.4

Do your have freckles on your face/body
 No163475.6
 Yes52824.4

Do you have any moles on your face/body
 No69031.9
 Yes147268.1

High-risk group*
 No181684
 Yes34616

*The high-risk group consisted of students’ with at least four out of five of the following characteristics: fair skin colour, fair eyes colour, fair hair freckles, and moles.