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0174 Preliminary results of shift work and cardiovascular risk factors: analysing baseline data of a prospective night shift worker cohort in Shenzhen, China
  1. Shelly Lap Ah Tsc1,2,
  2. Feng Wang1,2,
  3. Liuzhuo Zhang3,
  4. Yanfang Zhang3,
  5. Bo Zhang1,
  6. Yonghua He1,4,
  7. Shaohua Xie1,
  8. Mengjie Li1,
  9. Zhimin Li3,
  10. Ignatius Tak-sun Yu1
  1. 1JC School of Public Health and Primary Care, The Chinese University of Hong Kong, Sha Tin, Hong Kong
  2. 2Shenzhen Municipal Key Laboratory for Health Risk Analysis, Shenzhen Research Institute of the Chinese University of Hong Kong, Shenzhen, China
  3. 3Shenzhen Prevention and Treatment Center for Occupational Diseases, Shenzhen, China
  4. 4CUHK Centre for Public Health and Primary Care (Shenzhen), Shenzhen Research Institute of the Chinese University of Hong Kong, Shenzhen, China


Objectives The incidences of cardiovascular diseases (CVD), diabetes mellitus and metabolic syndrome increase rapidly in China, while the prevalence of night shift work is also increasing. This study aims to investigate the relationship between night shift work and CVD risk factors by analysing the baseline data of a prospective cohort study.

Method We are establishing a prospective night shift worker cohort in Shenzhen, China. More than 10 000 workers will be recruited and followed up. Currently, we have recruited more than 4000 workers but most questionnaires have not yet been input. A standardised questionnaire is used to collect information on lifetime night shift work, light at night, occupational hazards, sleep disorders, etc. Fasting blood and spot urine samples are also collected for further usage. CVD risk factors include hypertension, diabetes, overweight and dyslipidemia etc. All participants will have the annual or biennial occupational physical examination.

Results We reported data from a manufacturing company dealing with welding and shipment. We obtained 131 day workers and 370 shift workers with a response rate of 95%. The shift workers are significantly younger than day workers. The smoking and alcohol drinking status are comparable in two groups. The presence of number of CVD risk factors positively relate to the years of shift work after adjusting for age and other confounding factors.

Conclusions These preliminary results suggest long-term night shift work may increase CVD risk factors, while these will be updated in the conference. [National Natural Science Foundation of China (Project number 81273172 and 81372964), (Lap Ah Tse)]

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