Reliability of self-reported sun exposure in Canadian women and estimation of lifetime exposure to vitamin D from sun and diet. Academic Article uri icon

start page

  • 747

end page

  • 755


  • To assess the inter-method reliability of the Ovarian Cancer in Alberta (OVAL) survey developed to estimate adult vitamin D exposure from sun and diet for every tenth year, against the longer Geraldton Skin Cancer Prevention Survey (the assumed 'gold standard'). We also estimated total vitamin D exposure using the OVAL survey.A randomized crossover design to assess the inter-method reliability of sun exposure (OVAL v. Geraldton survey), using intra-class correlation and estimated total vitamin D exposure from sun and diet.Calgary, Alberta, Canada.Randomly selected women (n 90) aged 40-79 years.The average lifetime sun exposure of 13,913 h (average 411 h/year) from the Geraldton survey was not significantly different from the 13,034 h (average 385 h/year) from the OVAL survey for periods with sufficient UV radiation to stimulate vitamin D production. The intra-class correlation coefficient for average lifetime sun exposure was 0.77 (95% CI 0.69, 0.86); the annual average was 0.60 (95% CI 0.47, 0.74). Estimated vitamin D from diet and supplements increased with age.Our OVAL survey reliably estimated adult sun exposure relative to the Geraldton survey, suggesting that assessing sun exposure every tenth year is a reliable and efficient method for estimating sun contributions to lifetime vitamin D exposure.

date/time value

  • April 2014

Digital Object Identifier (DOI)

  • 10.1017/S136898001300178X

PubMed Identifier

  • 23885709


  • 17


  • 4


  • Adult
  • Aged
  • Alberta
  • Cross-Over Studies
  • Diet
  • Dietary Supplements
  • Female
  • Humans
  • Middle Aged
  • Reproducibility of Results
  • Self Report
  • Sunlight
  • Vitamin D