title: Associations between serum vitamin D levels and precocious puberty in girls.
abstract: OBJECTIVE
  Vitamin D deficiency has been linked to chronic diseases, such as diabetes mellitus, obesity and autoimmune disease. However, data on the vitamin D status and its association with precocious puberty in girls are limited. We aimed to investigate the association between serum 25-hydroxyvitamin D (25OHD) and precocious puberty in girls.
  
  
  METHODS
  A total of 60 girls with central precocious puberty (CPP) and 30 control girls were enrolled. Anthropometric measurement and serum level of 25OHD were estimated for all subjects.
  
  
  RESULTS
  There was a significant difference in the mean serum 25OHD concentration between the precocious puberty group and the control group (17.1±4.5 ng/mL vs. 21.2±5.0 ng/mL, P<0.05). Forty-two of the 60 girls with CPP (70%) had vitamin D deficiency (defined as serum 25OHD<20 ng/mL) and 18 (30%) had vitamin D insufficiency. Of the 30 girls in the control group, vitamin D deficiency was seen in 13 subjects (43.3%), 15 subjects (50%) had vitamin D insufficiency, and 2 subjects (6.7%) had sufficient serum vitamin D (defined as serum 25OHD>30 ng/mL). Vitamin D deficient girls had a significantly higher odds ratio (OR, 3.05; 95% CI, 1.22-7.57, P=0.021).
  
  
  CONCLUSIONS
  These results showed that vitamin D levels may be associated with precocious puberty. Further studies are required to establish the potential effect of vitamin D status on puberty.
authors: Department of Pediatrics, Ajou University Hospital, Ajou University School of Medicine, Suwon, Korea.
authors: Hae Sang
authors: HS
authors: Lee
authors: Department of Pediatrics, Ajou University Hospital, Ajou University School of Medicine, Suwon, Korea.
authors: You Jin
authors: YJ
authors: Kim
authors: Department of Pediatrics, Ajou University Hospital, Ajou University School of Medicine, Suwon, Korea.
authors: Young Seok
authors: YS
authors: Shim
authors: Department of Pediatrics, Ajou University Hospital, Ajou University School of Medicine, Suwon, Korea.
authors: Hwal Rim
authors: HR
authors: Jeong
authors: Department of Pediatrics, Ajou University Hospital, Ajou University School of Medicine, Suwon, Korea.
authors: Eunbyul
authors: E
authors: Kwon
authors: Department of Pediatrics, Ajou University Hospital, Ajou University School of Medicine, Suwon, Korea.
authors: Jin Soon
authors: JS
authors: Hwang
keywords: Female; Precocious puberty; Vitamin D