Table 1.
Baseline subject characteristics of the FLOW cohort study (N=609)
| Subject Characteristics | n (%) or Mean ± SD |
|---|---|
| Age in years | 59.3 ± 6.1 |
| Female sex | 367 (60) |
| Body mass index | 31.8 ± 8.3 |
| Race / ethnicity | |
| White, non-Hispanic | 421 (69) |
| Black | 105 (17) |
| Other | 83 (14) |
| Cigarette Smoking (packs per day) | 0.85 ± 0.35 |
| Second hand smoke exposure (hours per week) | 1.10 ± 5.02 |
| Pulmonary Function | |
| FEV1 in liters | 1.79 ± 0.74 |
| FEV1 % predicted | 64 ± 23 |
| FEV1/FVC | 0.61 ± 0.15 |
| Six minute walk test, in meters | 412 ± 117 |
| Skeletal muscle strength | |
| Quadriceps (kilograms of force) | 27.1 ± 9.3 |
| Quadriceps % predicted† | 84.4 ± 25.6 |
| Short Physical Performance Battery | 10.6 ± 1.8 |
| COPD Severity Score | 10.1 ± 6.0 |
*
FEV1 % predicted values derived directly from the linear regression equations developed from the National Health and Nutrition Examination Survey (NHANES III).22
†
Muscle strength % predicted values generated from 302 age and sex matched control subjects without COPD employing linear regression controlling for age, gender, body mass index (BMI), and height.8