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GCSE Psychology · key term
The proportion of a population who have a condition at a particular time or during a specified period, including existing cases.
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 proportion of people in a specified population who have a condition at a particular time or during a specified period, including existing and new cases.
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.
The Netherlands sexual-orientation figures measure recent feelings of anxiety or depression, not diagnosed disorders. Do not directly compare them with England's APMS condition prevalence.
When quoting a statistic, identify its population and, where given, its timescale. British and worldwide prevalence estimates are not interchangeable.
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Prevalence measures how many people have a condition at a particular time or during a stated period. 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.
The proportion of a specified population who have a condition during a specified period or at a specified time.
The proportion of a specified population experiencing a condition during a stated period. Lifetime prevalence concerns whether people have experienced it at any point in their lives.
