The Journal of Dermatology https://doi.org/10.1111/1346-8138.14742
Natta Rajatanavin Silada Kanokrangsee Wichai Aekplakorn
|Sufficiency (>30 ng/mL)||31 %||0 %|
|Insufficiency (20–30 ng/mL)||50 %||39 %|
|Deficiency (<20 ng/mL)||18 %||60 %|
|Severe deficiency (<10 ng/mL)||1%||1%|
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This study aimed to determine the prevalence of vitamin D insufficiency among Thai dermatologists compared with the general working‐age population in Bangkok. A cross‐sectional study was conducted in healthy Thai physicians who had at least 1 years’ experience in dermatology practise and a subsample of the general Thai population from the Fourth National Health Survey. Serum 25‐hydroxyvitamin D (25OHD), a combination of 25(OH)D2 and 25(OH)D3, levels in both groups were measured using liquid chromatography coupled with mass spectrometry. The majority of dermatologists were of Fitzpatrick skin type III (n = 61, 61.3%) or IV (n = 32, 33.3%).
The mean serum 25(OH)D and 25(OH)D3 levels were 18.9 and 18.2 ng/mL, respectively,
whereas the corresponding levels in the general population were 26.5 and 25.8 ng/mL.
- None of the dermatologist had serum 25(OH)D sufficiency (>30 ng/mL),
- 38 (38.78%) had vitamin D insufficiency (20–30 ng/mL) and
- 60 (61.22%) had vitamin D deficiency (<20 ng/mL).
- The frequency of vitamin D deficiency in dermatologists was significantly higher than in the general population
- (61.2% vs 19.2%, P < 0.001).
- Ninety percent of dermatologists used sunscreen daily and spent time mostly indoors.
Dermatologists used physical sun‐protection more than half of the time when outdoors, for example, a
- book or paper as a sunshade (70.3%)
- an umbrella (48.4%)
- a long‐sleeved shirt (20.4%) or a
- hat (9.7%).
In conclusion, dermatologists showed a remarkably high prevalence of vitamin D deficiency which may be due to inadequate exposure to sunlight, regular use of sunscreen and practicing various sun‐protection activities.Dermatologists use sun block, stay indoors, and have low vitamin D (Thai in this study) – Dec 2018
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