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Seasonal variations in serum 25-hydroxy vitamin D levels in a Swedish cohort

Overview of attention for article published in Endocrine, February 2015
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About this Attention Score

  • In the top 25% of all research outputs scored by Altmetric
  • High Attention Score compared to outputs of the same age (94th percentile)
  • High Attention Score compared to outputs of the same age and source (96th percentile)

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36 X users
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4 YouTube creators

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Title
Seasonal variations in serum 25-hydroxy vitamin D levels in a Swedish cohort
Published in
Endocrine, February 2015
DOI 10.1007/s12020-015-0548-3
Pubmed ID
Authors

Eva Klingberg, Göran Oleröd, Jan Konar, Max Petzold, Ola Hammarsten

Abstract

To study seasonal inter-individual and intra-individual variations in serum 25-hydroxy vitamin D (25(OH)D) and to explore parameters associated with 25(OH)D in a healthy Swedish adult population. 540 blood donors (60 % men; mean age 41 ± 13 years) and 75 thrombocyte donors (92 % men, aged 46 ± 11 years) were included. Serum was collected during 12 months and analyzed for 25(OH)D and parathyroid hormone (S-iPTH). The blood donors answered questionnaires concerning vitamin D supplements, smoking, physical activity, sunbed use and sun holidays. Repeated serum samples were collected from the thrombocyte donors to study the intra-individual variations in S-25(OH)D. S-25(OH)D varied greatly over the year correlating with the intensity of the UV-B irradiation (r S = 0.326; p < 0.001). During January-March, a S-25(OH)D level below the thresholds of 50 and 75 nmol/L was observed in 58 and 88 %, respectively, and during July-September in 11 and 50 % (p < 0.001). S-25(OH)D was negatively correlated with body mass index and S-iPTH, but was significantly higher in holiday makers in sunny destinations, sunbed users, non-smokers, and in the physically active. The intra-individual analyses showed a mean increase in S-25(OH)D by 8 nmol/L/month between April and August. Approximately 75 % had serum 25(OH)D values <75 nmol/L during 75 % of the year and 50 % had serum 25(OH)D <50 nmol/L during 50 % of the year. Serum 25(OH)D was strongly associated with parameters related to sun exposure, but only weakly with intake of vitamin D supplements.

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Mendeley readers

Mendeley readers

The data shown below were compiled from readership statistics for 125 Mendeley readers of this research output. Click here to see the associated Mendeley record.

Geographical breakdown

Country Count As %
Mexico 1 <1%
United States 1 <1%
Portugal 1 <1%
Switzerland 1 <1%
Unknown 121 97%

Demographic breakdown

Readers by professional status Count As %
Student > Master 23 18%
Student > Ph. D. Student 17 14%
Student > Bachelor 15 12%
Researcher 9 7%
Student > Postgraduate 9 7%
Other 26 21%
Unknown 26 21%
Readers by discipline Count As %
Medicine and Dentistry 44 35%
Biochemistry, Genetics and Molecular Biology 14 11%
Agricultural and Biological Sciences 8 6%
Nursing and Health Professions 7 6%
Sports and Recreations 5 4%
Other 14 11%
Unknown 33 26%
Attention Score in Context

Attention Score in Context

This research output has an Altmetric Attention Score of 28. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 10 June 2023.
All research outputs
#1,364,945
of 25,137,221 outputs
Outputs from Endocrine
#63
of 1,895 outputs
Outputs of similar age
#19,563
of 371,835 outputs
Outputs of similar age from Endocrine
#2
of 32 outputs
Altmetric has tracked 25,137,221 research outputs across all sources so far. Compared to these this one has done particularly well and is in the 94th percentile: it's in the top 10% of all research outputs ever tracked by Altmetric.
So far Altmetric has tracked 1,895 research outputs from this source. They typically receive a little more attention than average, with a mean Attention Score of 5.7. This one has done particularly well, scoring higher than 96% of its peers.
Older research outputs will score higher simply because they've had more time to accumulate mentions. To account for age we can compare this Altmetric Attention Score to the 371,835 tracked outputs that were published within six weeks on either side of this one in any source. This one has done particularly well, scoring higher than 94% of its contemporaries.
We're also able to compare this research output to 32 others from the same source and published within six weeks on either side of this one. This one has done particularly well, scoring higher than 96% of its contemporaries.