Cognitive complaints, depressive symptoms, and cognitive impairment: are they related?

OBJECTIVES

To examine whether concurrent depressive symptoms and self- and informant-reported cognitive impairments are related to cognitive complaints.

DESIGN

Longitudinal aging study of the relationship between depressive symptoms, reported cognitive impairments, and cognitive complaints. Mixed-effects regression models were used to determine whether scores on the Center for Epidemiologic Studies Depression Scale (CES-D) and Clinical Dementia Rating Scale (CDR) predicted cognitive complaints. The Cognitive Failures Questionnaire (CFQ) assessed cognitive complaints.

SETTING

A community-dwelling sample in Baltimore, Maryland.

PARTICIPANTS

One hundred five cognitively normal older individuals with a mean baseline age of 75 followed for an average of 4 years.

MEASUREMENTS

The CES-D measured depressive symptoms. The CDR Sum of Boxes (CDR-SB) measured self- and informant-reported impairment, and the CFQ measured cognitive complaints.

RESULTS

Greater depressive symptoms and reported impairments are associated with higher CFQ scores. In addition, there was a significant interaction between depressive symptoms and reported impairment. Specifically, individuals without reported cognitive impairment had the strongest association between depressive symptoms and cognitive complaints. Finally, reported impairments interact with baseline age, suggesting that the relationship between reported impairments and cognitive complaints is strongest in individuals younger than 80.

CONCLUSION

These findings confirm a relationship between reported cognitive impairment and cognitive complaints in older individuals and highlight the extent to which age and depressive symptoms account for variation in complaints. These factors should be considered when interpreting cognitive complaints in a clinical setting.