Is cognitive functioning 1 year poststroke related to quality of life domain?

Previous studies on the association between poststroke cognitive impairment and quality of life (QoL) have shown divergent results. In this study, we investigated the relationships between cognitive functioning and various QoL domains at 1 year poststroke. This was a cross-sectional study, examining 92 patients at 1 year poststroke. Cognitive functioning was measured with a neuropsychological test battery covering language, attention and psychomotor function, memory, visuoperception, and neglect. QoL domains were functional independence (Barthel Index), social participation (Frenchay Activities Index), depressive mood (Center for Epidemiological Studies Depression Scale), and life satisfaction (Life Satisfaction Questionnaire). Bivariate and multivariate relationships between cognitive and QoL variables were analyzed, the latter both with and without controlling for demographic variables and motor impairment. The prevalence of cognitive impairments varied between 19.3% (neglect) and 72% (attention and psychomotor function). Correlations between cognitive functioning and QoL were strongest for social participation (0.41-0.60, P <.01) and functional independence (0.13-0.58, P <.05). The percentages of variance explained by the total cognition score were 19% for functional independence, 40% for participation, 8% for life satisfaction, and 5% for depression. Controlling for demographic factors and motor impairments resulted in negligible percentages of variance additionally explained by cognitive functioning. The percentages of explained variance were somewhat lower in the analyses with the separate cognitive domains and not significant for depression. Poor cognitive functioning was associated with reduced functional independence, social participation, depressive mood, and life satisfaction 1 year post; however, motor impairment was a stronger determinant of long-term QoL than cognitive functioning.