Seasonal Changes in Vitamin D-Effective UVB Availability in Europe and Associations with Population Serum 25-Hydroxyvitamin D.

Nutrients · 2016 · PMC5037520 · PMID 27589793

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a clear trendno p-value reported

The data shows a clear trend of decreasing UVB availability on moving from South to North within Europe, which would be predicted by the increasing SZA as one moves from ~35° N to ~69° N.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.