GCSE Combined Science (AQA)

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Incidence of Disease

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Organisation Animal Tissues, Organs and Organ Systems

Incidence of Disease

3:57 Disease, Risk Factors and Sampling
Spec 4.2.2.5
Previous Disease Interactions Next Principles of Sampling Data
  • Epidemiology studies the distribution and causes of diseases and health issues in populations.
  • Epidemiologists study outbreaks of diseases, including global pandemics, and risk factors for non-communicable diseases.
  • The incidence of a disease refers to the number of new cases in a population.
  • It's essential to translate disease incidence data between graphical and numerical forms and to draw and interpret tables and graphs.
  • Various charts and graphs are used to represent disease data, including tables, bar charts, histograms, and connected scatter diagrams.
  • Tables show data for different variables; bar charts display information about different categories.
  • Histograms show ranges of numbers and are distinguished from bar charts by having adjacent bars.
  • Connected scatter diagrams, similar to line graphs, help identify correlations between two variables, and may require drawing a line of best fit.
  • Interpreting these charts and graphs is crucial and should be practiced for exams.
  • Example question: Describe how the number of males with diabetes changes over time using a bar chart.
  • Steps to interpret the graph include identifying the type of graph, deciding what information the question refers to, identifying the overall trend in the data, and quoting relevant data to justify conclusions.
  • The example shows an increase in the number of males with diabetes from the first to the third age category, followed by a decrease.
  • The ability to interpret graphs is an important skill for exams.

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