title: Vitamin d status and anthropometric indices of an omani study population.
abstract: OBJECTIVE
  Serum 25-hydroxyvitamin D [25(OH)D] concentrations reflect vitamin D status, with deficiency implicated as causative of many diseases. This study assessed vitamin D status and anthropometric indices in a sample of healthy Omanis.
  
  
  METHODS
  Serum 25(OH)D concentrations were measured by high performance liquid chromatography in 206 healthy Omanis, aged 18-55 years (mean age: men 31.1, women 26.8) in Muscat, Oman. Of this number, 95% indicated that they had never taken vitamin D supplements. Findings were compared with published values for populations domiciled in more northerly latitudes. Classical procedures were used to determine global obesity (body mass index [BMI]), and central obesity determined by waist circumference, waist-to-hip ratio (WHR), and waist-to-height ratio.
  
  
  RESULTS
  Women, as compared to men, had markedly lower concentrations of 25(OH)D. Applying the cut-off point of serum 25(OH)D levels at 50 nmol/L, the prevalence of vitamin D deficiency in the study population was 87.5%; this was higher than the rates reported for the British, and European-, Hispanic-, and African-Americans. At a BMI cut-point of ≥30 kg/m(2), the prevalence of obesity was 14.6%; this was lower than the rates reported for European-, Hispanic-, and African-Americans. Levels of 25(OH) D increased relative to age and obesity. WHR was the main predictor of 25(OH)D levels.
  
  
  CONCLUSIONS
  The striking vitamin D deficiency seen in the study population, relative to more northerly populations, may be linked to sun avoidance, inadequate dietary vitamin D, and virtual non-intake of supplemental vitamin D. Age and male-gender determined the status of vitamin D and of obesity.
authors.affiliation: Department of Biochemistry, College of Medicine and Health Sciences, Sultan Qaboos University, Muscat, Oman;
authors.forename: Clifford
authors.initials: C
authors.lastname: Abiaka
authors.forename: Marit
authors.initials: M
authors.lastname: Delghandi
authors.forename: Meenu
authors.initials: M
authors.lastname: Kaur
authors.forename: Mohsin
authors.initials: M
authors.lastname: Al-Saleh
keywords: 25-hydroxyvitamin D; Anthropometric indices; High-performance liquid chromatography; Oman; Vitamin D