Lifestyle and Health Unit 1.3

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Lifestyle and Health

Learning Objectives:

  • What is risk?
  • How is risk measured?
  • What factors affect the risk of contracting cancer?


Risk is a measure of probability that damage to health will occur as a result of a given hazard. The concept of risk has two elements:

  • The probability that a hazardous event will occur.
  • The consequences of that hazardous event.

Risk is measured by comparing the likelihood of harm occurring in those exposed to a hazard to those who aren't exposed to it (generally the control group). Risk can be measured as a value that ranges from 0% (no harm will occur) to 100% (harm will certainly occur). Health risks need a time-line so a patient can be told how long they…


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