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History
Events other than the treatment that occur between pretest and posttest may affect outcomes. No studies from 2019-2022 because of COVID
Maturation
Changes within participants (e.g., aging, fatigue, growth) that occur with the passage of time.
Testing
Effects of taking a test more than once, such as practice or familiarity effects.
Instrumentation
Changes in measurement instruments, observers, or scoring procedures across time.
Statistical Regression
Extreme scores tend to move closer to the mean on retesting.
Selection**
Systematic differences in characteristics of groups being compared.
Attrition (Mortality)
Loss of participants from groups differentially influences results.