4.7 Article

Vitamin D Status and Associated Factors of Older Adults in the Cross-Sectional 2015-2017 Survey

Journal

NUTRIENTS
Volume 15, Issue 20, Pages -

Publisher

MDPI
DOI: 10.3390/nu15204476

Keywords

vitamin D; Chinese older adults; 25-hydroxyvitamin D; CACDNS 2015-2017

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This study aimed to understand the nutritional status of vitamin D and its influencing factors in Chinese older adults. The results showed that vitamin D deficiency and insufficiency are very common in Chinese older adults, with women, people aged and above 70 years, ethnic minorities, urban residents, midlands or western residents, warm or medium temperate zone residents, people with middle school education or above, abdominal obesity and anemia being at higher risk. Latitude has the greatest impact on vitamin D deficiency and insufficiency.
Vitamin D is beneficial for maintaining good health; however, there is a lack of nationally representative data reported, particularly in older adults. To better understand the nutritional status of vitamin D and its influencing factors on Chinese older adults, we adopted stratified random sampling to select serum samples originating from the Chronic Disease and Nutritional Survey Biobank of Chinese Residents in 2015-2017. Serum 25-hydroxyvitamin D (25(OH)D) concentrations were determined by enzyme-linked immunoassay. The OR and PR of associated factors for vitamin D deficiency and insufficiency were calculated. In the study, a total of 6273 participants were included. Median serum 25(OH)D concentration was 18.48 (13.27-24.71) ng/mL. The overall rate of vitamin D deficiency and insufficiency was 58.27% (<20 ng/mL), and the VDD rate was 22.17%, which is worse than 5 years ago by nearly 20%. The likelihood of vitamin D deficiency and insufficiency is increased in women, people aged and above 70 years, ethnic minorities, people living in urban areas, midlands, or western areas, warm or medium temperate zones, with middle school and above education level, and people with abdominal obesity and anemia would increase the possibility of vitamin D deficiency and insufficiency with latitude having the greatest impact on vitamin D deficiency and insufficiency. Overall, vitamin D deficiency and insufficiency are very common in Chinese older adults. They should be encouraged to improve their vitamin D nutritional status through enough sunshine exposure and increasing vitamin D intake through diet or supplements.

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