Perceived control of asthma and quality of life among adults with asthma.
Katz-PP; Yelin-EH; Eisner-MD; Blanc-PD
Am J Respir Crit Care Med 2001 Apr; 163(5)(2)(Suppl):A315
Background: Perceived control of certain chronic conditions influences both quality of life (QOL) and psychological adjustment. We wished to establish this relationship among adults with asthma. Methods: Data were drawn from multiple waves of a longitudinal cohort study of adults with asthma surveyed by telephone at 18-month intervals (n=128). A scale measuring perceived control of asthma (PCoA) was administered at baseline and follow-up. This 12-item scale was derived from a validated arthritis perceived control measure. The PCoA showed high internal consistency (Cronbach's a = .76) and was significantly correlated with asthma severity both at baseline (r=-.27, p=.002) and at follow-up (r=-.23, p=.008). The Marks Asthma Quality of Life Questionnaire (AQLQ) and CES-D depressive symptom scale were also administered longitudinally. We estimated the association between changes in PCoA over time and AQLQ and CES-D scores at follow-up, controlling for baseline AQLQ, CES-D, and changes in asthma severity. Results: Even controlling for changes in severity and prior AQLQ, decreases in PCoA were associated with worse QOL at follow-up (p<.0001). Similarly, controlling for changes in severity and prior CES-D scores, decreases in PCoA were associated with higher levels of depressive symptoms at follow-up (p=.004). In these models, PCoA explained 11% of the variance in AQLQ (model R2=.25) and 6% of the variance in CES-D (model R2=.12). Conclusions: Although changes in asthma severity are associated with changes in individuals' perceived control of asthma, PCoA has an independent effect on asthma-specific QOL and psychological adjustment.
Respiratory-system-disorders; Psychological-effects; Psychological-factors; Psychological-reactions; Psychological-responses; Respiration; Breathing
Research Tools and Approaches: Social and Economic Consequences
American Journal of Respiratory and Critical Care Medicine. Abstracts of the American Thoracic Society 2001 International Conference, May 18-23, 2001, San Francisco, California
Cardiovascular Research Institute, The University of California, San Fransico California