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The PASE is an easily administered and scored instrument that measures the level of physical activity in individuals aged 65 years and older. The instrument is comprised of self-reported occupational, household and leisure activities items over a one week period. The PASE scoring algorithm was derived from physical activity measured by movement counts from an electronic physical activity monitor, activity diaries, and self-assessed activity levels in a general population of noninstitutionalized older persons. The PASE can be used to measure physical activity levels in epidemiologic surveys of older people as well as to assess the effectiveness of exercise interventions.