Environment-wide association study to identify factors associated with hematocrit: evidence from the Guangzhou Biobank Cohort Study

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• 作者：Yi Zhong ; MBBS^a ; Chaoqiang Jiang ; MD^b ; Kar Keung Cheng ; PhD^c ; Weisen Zhang ; MD^b ; Yali Jin ; MD^b ; Tai Hing Lam ; MD^a ; ^{hrmrlth@hku.hk" class="auth_mail" title="E-mail the corresponding author} ; Jean Woo ; MD^d ; Gabriel Matthew Leung ; MD^a ; C. Mary Schooling ; PhD^a ; ^e
• 关键词：Cardiovascular disease ; Chinese ; Coagulability ; Environment-wide association study ; Hematocrit
• 刊名：Annals of Epidemiology
• 出版年：2016
• 出版时间：September 2016
• 年：2016
• 卷：26
• 期：9
• 页码：638-642.e2
• 全文大小：684 K

文摘

In randomized controlled trials reducing high hematocrit (Hct) in patients with polycythemia vera protects against cardiovascular disease (CVD) events, whereas increasing Hct in anemia patients causes CVD events. Hct is influenced by environmental and lifestyle factors. Given limited knowledge concerning the drivers of Hct, we took an agnostic approach to identify drivers of Hct.

Methods

We used an environment-wide association study to identify environmental and lifestyle factors associated with Hct in 20443 older Chinese adults (mean age = 62.7 years) from the Guangzhou Biobank Cohort Study. We evaluated the role of 25 nutrients, 40 environmental contaminants, two metals (only available for 10405 participants), and six lifestyle factors in relation to Hct, adjusted for sex, age, recruitment phase, and socioeconomic position.

Results

In a mutually adjusted model vitamin A, serum calcium, serum magnesium, and alcohol use were associated with higher Hct, whereas physical activity was associated with lower Hct.

Conclusions

Despite the difficulty of ascertaining causality, finding both expected (vitamin A and physical inactivity) and novel factors (serum calcium, serum magnesium and alcohol use) strongly associated with Hct illustrates the utility of environment-wide association study to generate hypotheses regarding the potential contribution of modifiable exposures to CVD.