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GCSE Psychology · key term
The number of new cases of a condition occurring in a population during a specified period.
Used by AQA and OCR
Paper 2
Revise: Changing Incidence of Mental Health ProblemsIncidence means the number of new cases occurring in a population during a specified period. It differs from prevalence, which includes people who already have the condition. Both can help us examine patterns over time, but they measure different things.
Paper 1
The number or rate of new cases of a condition arising in a specified population during a specified period.
Distinguish prevalence (all existing cases in a population during a specified period) from incidence (new cases arising during a specified period). A rise in prevalence does not by itself establish a rise in incidence.
Use the south-east London schizophrenia findings as evidence of a local incidence increase, not proof that every mental disorder increased throughout the UK.
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Incidence measures new cases arising during a period. Someone whose condition began several years ago can contribute to current prevalence without being a new case this year.
