Relationship between mean daily solar exposure and serum 25(OH)D concentrations during the study.

<p>¹Diamonds represent mean daily solar exposure during the study measured as Mega joules/m². Data obtained from the Australian Bureau of Meteorology (<a href="http://www.bom.gov.au/tas/observations/index.shtml" target="_blank">http://www.bom.gov.au/tas/observations/index.shtml</a>). ²Square points and y-axis error bars represent mean and 95% confidence intervals of serum 25(OH)D concentrations (nmol/L) measured at each study time point estimated by repeated-measures mixed methods linear regression; and sign-wave lines were calculated by mathematical modelling using coefficients for sine-wave analysis estimated using repeated-measures nonlinear regression.