Chest
Clinical Investigations: COPDA New Self-Administered Questionnaire to Monitor Health-Related Quality of Life in Patients With COPD
Section snippets
Development of the SOLQ
Three dimensions of health and one of treatment satisfaction were included in the new questionnaire. The physical function scale assesses the degree of dyspnea and the extent of physical limitation. This scale is unique because it includes items specific to pulmonary disease and items derived from the physical functioning scale of the SF-36. The emotional function scale measures the impact of the disease on patients' psychological well-being. The coping skills scale measures self-efficacy and
Subject Characteristics
Participants in the study were predominantly male, 95% men, with a mean age of 70 years for the reliability study and 67 years for the validation study. Ninety-five percent of the validation study participants were white and the remainder were African-American.
Reliability
Internal consistency, measured by Cronbach's α for the 203 clinic subjects, was high for each scale: physical function, 0.93; emotional function, 0.79; coping skills, 0.82; and treatment satisfaction, 0.90. A comparison of the scores
Discussion
This report describes a series of investigations that demonstrate the reliability, validity, and responsiveness of the SOLQ, a new self-administered health-related quality of life instrument for COPD. All four scales had excellent internal consistency. The test-retest reliability of the questionnaire was clearly demonstrated by the high intraclass correlation coefficients among patients with stable disease followed up over a 4-month interval. Despite the length of follow-up, a factor that could
Acknowledgments
We would like to thank our research team for their various contributions to this project: Jan Prodzinski, Barb Stansfeld, Barb Weinstein, Tasha Essen, Dr. Hu Lan Ding, Anneliese Schleyer, David Josephson, and Ed Nelson.
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†A complete listing of members is located in Appendix 1. Supported by grant CHS 91–007 and SDR 96–002 from the Department of Veterans Affairs, Veterans Health Administration, Health Services Research and Development Service. Dr. Tu was an Ambulatory Care fellow in the section of General Internal Medicine at the Veterans Affairs Puget Sound Health Care System.