The Functional Performance Inventory (FPI) was administered as a self-report measure of the effects of health on usual daily activities. The FPI is constructed of 65 items and multiple subscales, including body care, maintaining the household, physical exercise, recreation, spiritual activi¬ties, and social interaction with family and friends. Items range from activities that require a low level of exertion to activities that require a higher level of exertion. Subjects report the level of difficulty they experience in doing each activity on a four-point scale where 1 represents no difficulty, 2 some difficulty, 3 much difficulty, and 4 “don’t do” because of health. The data were transformed according to author guidelines, and the potential range for scores is 0–3 for the subscales and total FPI; higher scores reflect higher functional performance. The reliability and validity of the FPI has been established for people with COPD and it is sensitive to change, reflecting declines and increases in functional performance over time