Young Ah Lee1, Hwa Young Kim1, Hyunsook Hong2, Ji Young Kim1, Hyun Jin Kwon3, Choong Ho Shin1, Sei Won Yang1. 1. 1 Division of Endocrinology and Metabolism, Department of Pediatrics, Seoul National University Children's Hospital, Seoul National University College of Medicine, 28 Yeongeon-dong, Jongno-gu, Seoul 110-769, Republic of Korea. 2. 2 Medical Research Collaborating Center, Seoul National University Hospital, Seoul, Republic of Korea. 3. 3 Health and Exercise Science, Institute of Sports Science, Seoul National University, Seoul, Republic of Korea.
Abstract
OBJECTIVE: To evaluate the prevalence of vitamin D deficiency and predictors for low vitamin D status in Korean adolescents living between latitudes 33° and 39° N. DESIGN: A descriptive cross-sectional study. SETTING: Korea National Health and Nutrition Examination Survey (KNHANES) 2008-2009. SUBJECTS: A total of 1510 healthy adolescents aged 12-18 years (806 male, mean age 14.7 years) participated. Possible predictors for low vitamin D status (log-transformed 25-hydroxyvitamin D (25(OH)D) concentrations) were evaluated. RESULTS: The prevalence of vitamin D deficiency (25(OH)D<20 ng/ml) was 89.1% in spring, 53.7% in summer, 63.9% in autumn and 90.5% in winter. Winter season, older age, higher education level reached, being female, being obese, a lack of vitamin D supplementation, lower milk consumption (0-<200 ml/d) and a lack of physical activity were unadjusted predictors (all P < 0.05). Multiple linear regression analysis showed that winter season (P < 0.001), higher education level (P < 0.001) and a lack of vitamin D supplementation (P = 0.012) were independent predictors for low vitamin D status. The modifying effect of season on the association between vitamin D supplement use and vitamin D status was significant (P < 0.001). CONCLUSIONS: Vitamin D deficiency was highly prevalent in Korean adolescents, especially those in higher school grades. Vitamin D supplementation may contribute to maintain a better vitamin D status with lower seasonal variation. Further studies are required to determine optimal vitamin D intakes to maintain sufficient vitamin D status for Korean adolescents.
OBJECTIVE: To evaluate the prevalence of vitamin D deficiency and predictors for low vitamin D status in Korean adolescents living between latitudes 33° and 39° N. DESIGN: A descriptive cross-sectional study. SETTING: Korea National Health and Nutrition Examination Survey (KNHANES) 2008-2009. SUBJECTS: A total of 1510 healthy adolescents aged 12-18 years (806 male, mean age 14.7 years) participated. Possible predictors for low vitamin D status (log-transformed 25-hydroxyvitamin D (25(OH)D) concentrations) were evaluated. RESULTS: The prevalence of vitamin D deficiency (25(OH)D<20 ng/ml) was 89.1% in spring, 53.7% in summer, 63.9% in autumn and 90.5% in winter. Winter season, older age, higher education level reached, being female, being obese, a lack of vitamin D supplementation, lower milk consumption (0-<200 ml/d) and a lack of physical activity were unadjusted predictors (all P < 0.05). Multiple linear regression analysis showed that winter season (P < 0.001), higher education level (P < 0.001) and a lack of vitamin D supplementation (P = 0.012) were independent predictors for low vitamin D status. The modifying effect of season on the association between vitamin D supplement use and vitamin D status was significant (P < 0.001). CONCLUSIONS:Vitamin D deficiency was highly prevalent in Korean adolescents, especially those in higher school grades. Vitamin D supplementation may contribute to maintain a better vitamin D status with lower seasonal variation. Further studies are required to determine optimal vitamin D intakes to maintain sufficient vitamin D status for Korean adolescents.
Authors: Tae Young Han; Tae Seok Kong; Min Ho Kim; Jeong Don Chae; June Hyun Kyung Lee; Sook-Ja Son Journal: Ann Dermatol Date: 2015-02-03 Impact factor: 1.444
Authors: Hwa Young Kim; Young Ah Lee; Hae Woon Jung; Min Jeoung Gu; Ji Young Kim; Gyung Min Lee; Jieun Lee; Ju Young Yoon; Sei Won Yang; Choong Ho Shin Journal: Ann Pediatr Endocrinol Metab Date: 2017-12-31
Authors: Hwa Young Kim; Hae Woon Jung; Hyunsook Hong; Jae Hyun Kim; Choong Ho Shin; Sei Won Yang; Young Ah Lee Journal: J Korean Med Sci Date: 2017-10 Impact factor: 2.153