Table 1.
Participant characteristics
| Frail | Prefrail or Normal | |
|---|---|---|
| Treatment, n (%) | ||
| Lung volume reduction therapy | 20 (35.1) | 428 (51.6) |
| Medical therapy | 37 (64.9) | 401 (48.4) |
| Age, years median (IQR) | 69 (64–71) | 67 (63–70) |
| Male, n (%) | 34 (59.6) | 529 (59.7) |
| Race, n (%) | ||
| White (not Hispanic) | 52 (91.2) | 785 (94.7) |
| African American (not Hispanic) | 3 (5.3) | 30 (3.6) |
| Hispanic | 1 (1.8) | 4 (0.5) |
| Asian or Pacific Islander | 0 (0) | 8 (1.0) |
| Other | 1 (1.8) | 2 (0.2) |
| Marital status, n (%) | ||
| Single, never married | 0 (0.0) | 25 (3.0) |
| Separated | 0 (0.0) | 15 (1.8) |
| Divorced or annulled | 8 (14.0) | 119 (14.4) |
| Widowed | 8 (14.0) | 132 (15.9) |
| Married | 41 (71.9) | 538 (64.9) |
| Education, n (%) | ||
| Did not complete high school | 19 (33.3) | 153 (18.5) |
| Completed high school | 11 (19.3) | 272 (32.8) |
| Some college or post high school | 20 (35.1) | 280 (33.8) |
| Bachelor degree or higher | 7 (12.3) | 124 (15.0) |
| Economic status, n (%) | ||
| <$15,000 | 10 (17.5) | 145 (17.7) |
| $15,000–$29,999 | 24 (42.1) | 293 (35.7) |
| $30,000–$49,999 | 14 (24.6) | 219 (26.7) |
| ≥$50,000 | 9 (15.8) | 163 (19.9) |
| Questionnaires | ||
| St. George’s Respiratory Questionnaire composite, median (IQR) | 60.3 (52.8–69.1) | 48.7 (35.7–60.2) |
| SF-36, physical functioning median (IQR) | 15 (5–30) | 30 (15–50) |
| SF-36, physical composite, median (IQR) | 25.1 (21.3–31.6) | 30.1 (23.9–38.8) |
| SF-36, mental composite, median (IQR) | 46.0 (37.2–56.3) | 57.3 (47.4–61.7) |
| Pulmonary function testing | ||
| Forced expiratory volume in 1 s, % predicted, median (IQR) mMRC, median (IQR) | 23 (18.5–29.0) | 26 (20–34) |
| 4 (3–4) | 3 (2–4) | |
| Total lung capacity, % predicted, median IQR | 122 (106–134) | 119 (107–130) |
| Laboratory testing | ||
| Albumin abnormal | 1.8% | 5.2% |
| White blood cell count, median (IQR) | 8.5 (6.4–10.1) | 8.0 (6.6–9.9) |
Definition of abbreviations: IQR = interquartile range; SF-36 = Medical Outcomes Short Form-36; mMRC = modified Medical Research Council.
The data show the number of participants, with percentage in parentheses, unless the medians and IQRs are indicated.