Table 1.
Subject Characteristics
| RA (n = 441) |
SLE (n = 795) |
COPD (n = 418) |
|
|---|---|---|---|
| Sociodemographic factors | |||
| Age, 66+ years; % (n) | 40.7 (180) | 10.1 (80) | 53.3 (223) |
| Female; % (n) | 85.1 (376) | 92.2 (735) | 62.0 (259) |
| White, non-Hispanic; % (n) | 83.7 (370) | 68.1 (543) | 93.1 (389) |
| Education, > high school; % (n) | 69.0 (305) | 86.8 (692) | 67.2 (281) |
| Married or with partner; % (n) | 62.0 (274) | 59.9 (476) | 54.1 (226) |
| Health-related measures | |||
| Comorbidities; % (n) | |||
| 1 | 39.4 (162) | 34.0 (271) | 30.4 (127) |
| 2 or more | 24.0 (106) | 16.6 (132) | 49.8 (208) |
| Fatigue (range 0 – 10; higher = greater fatigue) | 4.9 (2.7) | 5.5 (2.3) | 4.8 (2.5) |
| Physical functioning (range 0 – 10; higher = worse functioning) | 3.6 (2.4) | 6.0 (1.2) | 3.3 (2.4) |
| Disease–specific measures | |||
| Rheumatoid arthritis (RA) | |||
| Pain rating; means (SD) (0=no pain, 100=very severe pain) | 30.0 (27.1) | ||
| Systemic lupus erythematosus (SLE) | |||
| Rating of SLE activity; mean (SD) (0=none, 10=severe) | 4.2 (2.8) | ||
| Chronic obstructive pulmonary disease (COPD) | |||
| Current smoker | 22.5 (94) | ||
| COPD Severity Score; mean (SD) (range 0-31, high=greater severity) | 7.8 (6.3) |