Table 1.

Characteristics of adult nonsmoking participants with COPD

Characteristics	M (SD) or n (%)
Age (years)	64.9 (6.3)
Gender: male (%)	28 (39%)
Race–ethnicity (White, non-Hispanic)	68 (94%)
Educational attainment
High school or less	32 (44%)
Some college	22 (31%)
College graduate or graduate degree	18 (25%)
Smoking history	46 (63%)
COPD severity score	7.9 (6.6)
SF-12 PCS score	35.4 (11.7)
AQ-20	8.2 (4.6)
Modified MRC dyspnea score	2.5 (1.2)
Restricted activity days due to a respiratory condition (days during the past month)	7.1 (12.3)

Note. AQ-20 = Airways Questionnaire 20; COPD = chronic obstructive pulmonary disease; PCS = physical component summary; SF = Short Form. The range of observed scores was 0–24 points (COPD severity), 0–17 points (AQ-20), 1–4 points (MRC), and 14.7–57.2 points (PCS).