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Relationship between cumulative ultraviolet exposure and cognitive function in a rural elderly Chinese population

Xin, Shimeng (School of Public Health, China Medical University, Shenyang, China ) ; Luan, Dechun (Institute for Nutrition and Food Hygiene, Liaoning Provincial Center for Disease Control and Prevention, Shenyang, China ) ; Wang, Xue (School of Public Health, China Medical University, Shenyang, China ) ; Wang, Fang (School of Public Health, China Medical University, Shenyang, China ) ; Liu, Yang (School of Public Health, China Medical University, Shenyang, China ) ; Gao, Qian (School of Public Health, China Medical University, Shenyang, China ) ;
  • 초록  

    Objectives Some researchers have focused on the relationship between vitamin D and cognition, but the conclusions are inconsistent. We estimated cumulative UV exposure could be used to represent the individual's long‐term vitamin D status and investigated its association with global cognitive function in elderly Chinese. Methods A total of 641 participants aged 60 years and over were recruited in a rural area of Shenyang, China. All were interviewed to obtain data regarding sociodemographic characteristics and time spent outdoors. Cognitive function was evaluated using the Montreal Cognitive Assessment‐Beijing version (MoCA‐BJ). Images of skin from UV‐exposed (dorsal hand) and UV‐protected (inner forearm) sites from each individual were graded by the Beagley‐Gibson system. Differences in skin‐grade between the 2 sites were used to indicate cumulative UV exposure level. Subjects were grouped in tertiles based on skin‐grade differences ( Results Skin‐grade differences were associated with self‐reported time spent outdoors. After adjustment for age, gender, education, BMI, whether living alone, income, diet, hypertension, and diabetes, a high UV exposure level was associated with better cognitive function (odds ratio = 0.643, 95% confidence interval = 0.427–0.969). Conclusions Greater cumulative UV exposure appears to be associated with better cognitive function in elderly adults.


  • 주제어

    cognition .   epidemiology .   risk factors .   UV exposure.  

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