A Four-Year Trend in Serum 25-Hydroxyvitamin D Levels in Western Connecticut.
Conn Med. 2016 Mar;80(3):133-7.
Belsky J, Sena S, Baqai S, Dilello LC, Petrini JR.
Table 3. % Distribution of 25-OH Vitamin D Levels, 2009–2012
| Year | < 10 ng/mL | < 20 ng/mL | < 30 ng/mL | > 100 ng/mL |
| 2009 | 1.45 | 17.6 | 51.7 | .14 |
| 2010 | .68 | 14.1 | 48.6 | .24 |
| 2011 | .44 | 12.9 | 46.2 | .10 |
| 2012 | .30 | 9.9 | 39.0 | .19 |
OBJECTIVE:
This study describes the trends in blood vitamin D levels in a regional population from 2009-2012 through a cross-sectional study design.
METHODS:
Over a four-year period (2009-2012), serum levels of 25-hydroxyvitamin D [25(OH)D] have been measured using an automated enzyme immunoassay with a steadily increasing number of tests performed each year. A total of 54700 tests were performed during this period, with a 90% increase in annual tests ordered.
RESULTS:
Mean and median serum levels of 25(OH) D showed statistically significant increases during this period. Those with 25(OH)D levels below 10 ng/mL represented 1.45% of the subjects in 2009 and 0.3% in 2012. The decrease in the proportion of subjects with 25(OH)D levels below 20 ng/mL and below 30 ng/mL was greatest out of all the proportioned subjects. Mean and median 25(OH)D levels increased with age in males and females.
CONCLUSION:
These results likely reflect increased health awareness in Western Connecticut compared with national surveys showing a temporal decrease in 25(OH)D levels.
PMID: 27169294
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Nice to see that some people are making modest increases in Vitamin D levels
See also Vitamin D
Increased use of D category listing has- Vitamin D use increased 3.7 X, Omega-3 increased 9 X (US 1999-2012) – JAMA Oct 2016
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