Risk Factors for Non-Communicable Diseases

Cards (25)

  • Communicable diseases

    Diseases that can be spread from person to person
  • Communicable diseases

    Spread by pathogens such as bacteria or viruses
  • Non-communicable diseases
    Diseases that cannot be passed from person to person
  • Diseases can cause ill health, which is defined as the state of physical and mental well-being
  • Causes of ill health

    • Communicable diseases
    • Non-communicable diseases
    • Poor diet
    • High levels of stress
    • Working with harmful chemicals
  • People with a defective immune system (e.g. HIV)

    Are much more likely to suffer from infectious diseases (e.g. TB)
  • Infection with HPV (human papilloma virus)

    Can cause cervical cancer
  • Infection with a pathogen
    Can trigger an allergy (e.g. asthma, dermatitis)
  • Physical illness (e.g. arthritis)

    Can trigger a mental illness (e.g. depression)
  • Non-communicable disease
    Diseases not spread from person to person, instead caused by risk factors
  • In the 1930s, rate of lung cancer began to increase sharply and scientists couldn't explain this
  • Scientists could not carry out experiments on humans to try to work out what causes lung cancer as that would be unethical
  • Epidemiology
    Studying the patterns of disease to determine risk factors
  • Lung cancer is much more common among cigarette smokers than among non-smokers

    Scientists look at how many cigarettes people smoked each day and then how many of these people developed lung cancer
  • Correlation
    A link between two variables
  • A correlation does not prove cause, it simply suggests that two variables might be linked
  • As the number of cigarettes smoked per day increases
    The risk of developing lung cancer also increases
  • Positive correlation

    When two variables increase or decrease together
  • As the number of years that a person smoked increases
    The risk of developing lung cancer also increases
  • Causal mechanism
    The scientific explanation for how a risk factor can cause a disease
  • Cigarette smoke contains chemicals which damage DNA and increase the risk of cancer, these are called carcinogens
  • Sampling
    Investigating a group of people to draw conclusions about the whole population
  • Ideally, we'd look at every single person in a population to investigate a disease-diet link, but in practice it's not possible to sample every single person
  • If we select our sample from only one town, it's possible that this does not represent the entire population of the country, so the sample is biased
  • To avoid bias in sampling

    • Take as large a sample as possible
    • Ensure the sample is random