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Night shift workers far more likely to have low vitamin D levels – May 2016

Determinants of vitamin d status among Jordanian employees: Focus on the night shift effect.

Int J Occup Med Environ Health. 2016;29(5):859-70. doi: 10.13075/ijomeh.1896.00657.
Alefishat E1, Abu Farha R2.


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OBJECTIVES: To assess the association between night work and 25-hydroxy vitamin D (25OHD) levels, and to evaluate effect of potential risk factors on 25OHD levels.

MATERIAL AND METHODS: A total of 140 adult Jordanian employees were recruited. Demographic, lifestyle and working patterns data were documented through a well-structured questionnaire. Vitamin D status was assessed by measuring circulating concentrations of 25OHD.

RESULTS:
Mean 25OHD level was 23.8 ng/ml. No significant difference was found in 25OHD levels between the summer and winter (p = 0.46), or between males and females (p = 0.35). The female night workers had significantly lower serum 25OHD levels compared to the female day workers (p = 0.01). No significant difference in serum 25OHD levels was found between the night and day male workers (p = 0.25). The number of night shifts/month was negatively correlated with 25OHD levels in both the males and females (p = 0.01 and p = 0.007, respectively). Age was positively correlated with 25OHD levels in both the males and females (p = 0.02 and p = 0.001, respectively). Body mass index was negatively associated with 25OHD levels in the whole sample (p = 0.03), but not within each gender group (p = 0.21 for the males and p = 0.09 for the females). Smoking had no significant association with 25OHD levels (p = 0.99 for the males and p = 0.22 for the females).

CONCLUSIONS: Our results suggest that women working night shifts are at higher risk of 25OHD deficiency, and, consequently, of other health problems linked to 25OHD deficiency.

PMID: 27518893 DOI: 10.13075/ijomeh.1896.00657

Created by admin. Last Modification: Wednesday September 13, 2017 11:44:19 UTC by admin. (Version 4)

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