attend their second interview and hence did not have 25(OH)D
results, their choice of guidelines was not recorded, their sun diary
was incomplete, or they were taking oral supplements containing
over 400 IU of vitamin D. 89 people participated in both the
summer and winter studies.
3.1. Summer study
104 participants (mean age 38.4
9.6 years) completed the
summer study: 74% (n = 77) were female, 71.2% (n = 74) were
Australian-born (includes a small number of participants with
second generation Australian Aboriginal ancestry or non-European
ancestry) and 87.5% (n = 91) were in full-time employment
(Table 1). Almost all (92.3%, n = 96) were non-smokers. Approximately
half of the participants self-reported as having fair skin
(48.1%, n = 50) and brown hair (45.2%, n = 47). The mean
25(OH)D concentration of the sample was 65.9
25.4 nmol/L
(range: 19.0–147 nmol/L). Univariate analysis showed that 25(OH)