Chinese Garment workers


Cohort Study

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Cohort:  Chinese Garment workers

Chemical Exposure:  Formaldehyde

Health Outcomes of interest

  • Leukemia
  • Asthma



  Cohort Leukemia Asthma
Total 4530 351  
Exp Groups   Cases RISK


FA – No exposure 500 3 0.006 1 52 0.104 1
FA – Low 2050 12 0.0056 0.93 386 0.188 1.8
FA – High 1980 46 0.023 3.83 1140 0.576 5.5



  • Calculate the Risk of each heath outcome for each exposure group

Risk = (cases) / (no. in exposure group)



  • Calculate the Relative Risk (RR) of each health outcome for each exposure group

RR = (Risk in Exp. Group) \ (Risk in control group)



  • Is the risk of Leukemia elevated by FA exposure? How strong is the evidence?




  • Is the risk of asthma elevated by FA exposure? How strong is the evidence?


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