The Cognitive Decline Scale of the Psychogeriatric Assessment Scales (PAS): Longitudinal data on its validity

Abstract

Objective. The Cognitive Decline scale of the Psychogeriatric Assessment Scales (PAS) uses informant data to assess retrospectively change from earlier in life. Data from a 7-8-year longitudinal study were used to assess the validity of this scale against changes in cognitive performance and mortality. Design and measures. PAS data were collected on three occasions, with gaps of 3.6 and 4.1 years between the waves. The Cognitive Decline score at Wave 3 was validated retrospectively against actual change on a brief test of current cognitive status (the PAS Cognitive Impairment scale) over the three waves, while the Cognitive Decline score at Wave 1 was assessed for predictive validity against..