title: [A cohort study on the relationship between blood pressure levels and the mortality of cerebro-cardiovascular diseases in Guangzhou workers].
abstract: OBJECTIVE
  To study the relative risk (RR) of mortalities of cerebro-cardiovascular diseases (CVD) in Guangzhou workers with hypertension.
  
  
  METHODS
  Prospective cohort study was conducted in 78,379 workers, aged >or= 35, from 399 factories. Cox regression model were mainly used for data analysis.
  
  
  RESULTS
  (1) There were 48,705 male and 29,674 female workers in the cohort. All workers were followed-up for 8 years. 363 CVD deaths (male 305, female 58) mainly died of stroke, coronary heart disease and hypertension. The crude mortalities were 78.58/100,000 person years in male and 24.55/100,000 person years in female. (2) Compared with the optimal or normal blood pressure (ONBP), the RR (95%) of CVD deaths with high blood pressure (HBP) were 6.19 (4.85 - 7.91) in male and 2.78 (1.59 - 4.85) in female. In male, compared with ONBP, the RR of CVD deaths without illness but with 1st-grade HBP at baseline, and of those suffered non-CVD but with 1st-grade HBP at baseline, and of those suffered CVD with 2nd-grade HBP at baseline were 3.98, 3.25 and 3.15 respectively (P < 0.01). (3) After stratifying of age, smoking, drinking, educational levels and occupational exposure, the RR of CVD deaths was higher in those who were younger, or ever-smoking, non-drinking, higher educational level, exposed to occupational hazards and with hypertension.
  
  
  CONCLUSIONS
  There is relationship between BP levels and CVD mortality. High BP may affect CVD deaths at younger age. Comprehensive measures should be used to reduce the risk of CVD deaths.
authors.affiliation: Guangzhou Occupational Diseases Prevention and Treatment Center, Guangzhou 510620, China.
authors.forename: Wei-sen
authors.initials: WS
authors.lastname: Zhang
authors.forename: Chao-qiang
authors.initials: CQ
authors.lastname: Jiang
authors.forename: Th
authors.initials: T
authors.lastname: Lam
authors.forename: Wei-wei
authors.initials: WW
authors.lastname: Liu
authors.forename: Sy
authors.initials: S
authors.lastname: Ho
authors.forename: Jian-min
authors.initials: JM
authors.lastname: He
authors.forename: Min
authors.initials: M
authors.lastname: Cao
authors.forename: Qing
authors.initials: Q
authors.lastname: Chen
mesh_terms: D000328:Adult; D000368:Aged; D001794:Blood Pressure; D002318:Cardiovascular Diseases / Q000401:mortality*; D002561:Cerebrovascular Disorders / Q000401:mortality*; D015331:Cohort Studies; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies