Characteristics of the study population and the classification of need of treatment according to found skin disease.

*Pearson's Chi-Squared test or Fisher's Exact test.#Basic education (comprehensive schools), secondary level (upper secondary schools, vocational schools), tertiary level (universities, polytechnics).¤Skin findings which did not require treatment are excluded (for example benign skin tumors, androgenetic alopecia and erytematoteleangiectatic rosacea).