The serum levels of Vit D in subjects who used sunscreen were significantly lower than those who did not ( p = 0.004). Less than half of the participants used sunscreen during the day. Resultsįew of the participants were aware of the biological functions of Vit D (8.8%), the causes of Vit D deficiency (16.7%), and the sources of Vit D (9.3%). A P value < 0.05 was considered statistically significant. Statistical analyses were conducted using SPSS software. Serum Vit D levels were measured using an electrochemiluminescence method and dietary intake of Vit D was assessed using a Food Frequency Questionnaire. Each subject completed a questionnaire containing items about demographic characteristics, knowledge about Vit D and their use of sunscreen. This cross-sectional survey was performed in northeastern Iran, among 940 female adolescents in January 2015. We aimed to evaluate the knowledge and behavior of female adolescents with respect to the association between sunlight exposure, sunscreen use, and Vit D status.

Vitamin D (Vit D) deficiency/insufficiency is an important risk factor for several chronic conditions.

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