Optimal sunscreen use, during a sun holiday with a very high ultraviolet index, allows vitamin D synthesis without sunburn.

Br J Dermatol · 2019 · PMC6899952 · PMID 31069787

Europe PMC DOI

hedged sentences

0.0470

closest p · 0.9× alpha

0.0470

boldest claim

The sentences

borderline significantP = 0·047actually significant

There was a borderline significant difference in skin type between all groups ( P = 0·047), which was lost when the control group was excluded ( P = 0·15).

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of borderline significanceno p-value reported

This difference was of borderline significance and had no effect on any of the vitamin D outcomes.

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highly significantno p-value reported

What does this study add? Sunscreens (sun protection factor, SPF 15) applied at sufficient thickness to inhibit sunburn during a week‐long holiday with a very high UV index still allow a highly significant improvement of serum 25‐hydroxyvitamin D 3 concentration.

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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.