[mcguire]

Higher ultraviolet light exposure from:

"The UK Biobank has data from which behavioural and geographic UV exposures can be estimated. Firstly, participants were asked ‘how many times a year would you use a solarium or sunlamp?’ We recoded the responses to create a solarium use variable (solarium user or solarium non-user, defined as one or more times per year versus never or less than one time per year)."

and

"Secondly, we estimated an annual average residential shortwave radiation (SWR; kJ/m2) over the follow-up period variable for each participant. Downward SWR is the total incoming solar energy over the Earth's surface in the shortwave spectrum and comprises both UVA and UVB radiation, (Yu et al., 2021) the components solar radiation that have effects on human health. The Japan Aerospace Exploration Agency (JAXA) calculates half-monthly average of daily downward SWR (250 nm–2500nm) measurements using daily data from the Moderate Resolution Imaging Spectroradiometer (MODIS) instrument on NASA's Aqua and Terra satellites, considering cloud and aerosol thickness (Murakami, 2010). These measurements are available at a 0.05°x.0.05° spatial resolution."

So, "Did you use a sunroom at least once?" and "How much solar radiation does where you live according to our model?"