The Cognitive Difficulties Scale (CDS): Psychometric Characteristics in a Clinical Referral Sample.

Area of Science:

• Neuropsychology
• Cognitive Science
• Psychometrics

Background:

• The Cognitive Difficulties Scale (CDS) is a widely used self-report measure for subjective cognitive complaints.
• Previous research indicates the CDS can predict cognitive decline in older adults.
• The scale requires a fifth-grade reading level, making it accessible.

Purpose of the Study:

• To rigorously evaluate the psychometric properties of the 39-item Cognitive Difficulties Scale (CDS).
• To determine the factor structure and validity of the CDS in a clinical population.
• To establish the reliability and clinical utility of the CDS for assessing cognitive difficulties.

Main Methods:

• A principal components analysis with varimax rotation was performed on data from 512 outpatient referrals.
• Factor scores were analyzed against demographic data, cognitive tests (Digit Span, Wechsler Memory Scale-IV), and psychological measures (MMPI-2).
• Internal consistency (Cronbach's alpha) and correlations with external criteria were assessed.

Main Results:

• Six distinct dimensions of cognitive complaints emerged, explaining 64% of the variance: attention/concentration, praxis, prospective memory, speech problems, memory for names, and temporal orientation.
• The identified factors demonstrated strong internal consistency (alphas > .850).
• CDS scores significantly correlated with MMPI-2 measures of anxiety, depression, somatic preoccupation, and thought disturbance, but not with objective cognitive tests.

Conclusions:

• The Cognitive Difficulties Scale (CDS) functions as a multidimensional measure of subjective cognitive complaints.
• The CDS provides a psychometrically validated framework for generating a six-subscale profile.
• The scale possesses clinical utility and is a valuable research tool for age-related cognitive changes and metacognition.