Table 1 Characteristics of participants with COPD aged 40–79 by sex, U.S. NHANES 2007–2012
Demographic characteristic | Men n = 959 | Women n = 560 | p value |
|---|---|---|---|
Age (mean, SE) | 62.2(0.5) | 61.7(0.5) | 0.9249 |
Age group (years) | Â | Â | 0.3987 |
 40–64 (%) | 67.7 (63.9, 71.3) | 65.4 (60.9, 69.6) |  |
 65–79 (%) | 32.3 (28.7, 36.1) | 34.6 (30.4, 39.1) |  |
Race/ethnicity (%) | Â | Â | 0.0648 |
 Mexican-American | 2.7 (1.8, 4.1) | 1.2 (0.7, 2.0) |  |
 Other Hispanic | 2.2 (1.4, 3.4) | 1.7 (0.9, 3.0) |  |
 Non-Hispanic White | 83.6 (79.2, 87.2) | 84.5 (80.1, 88.1) |  |
 Non-Hispanic Black | 7.8 (6.0, 10.1 | 7.5 (5.6, 9.9) |  |
 Other | 3.8 (2.3, 6.2) | 5.1 (2.9, 8.8) |  |
BMI (kg/m2) (mean, SE) | 28.2(0.2) | 27.0 (0.3) | 0.0032 |
BMI category (%) |  |  | < 0.0001 |
 Underweight | 0.8 (0.4, 1.7) | 3.8 (2.3, 6.1) |  |
 Normal | 28.3 (24.2, 32.7) | 39.8 (34.6, 45.2) |  |
 Overweight | 41.7 (37.7, 45.8) | 31.1 (26.3, 36.3) |  |
 Obese | 29.2 (25.9, 32.8) | 25.4 (21.1, 30.2) |  |
Smoking (%) | Â | Â | 0.0404 |
 Never | 24.7 (20.5, 29.4) | 32.9 (27.5, 38.9 |  |
 Former | 41.2 (37.7, 44.8) | 33.5 (26.6, 41.2) |  |
 Current | 34.1 (30.0, 38.4) | 33.5 (28.2, 39.3) |  |
Spirometry | Â | Â | Â |
 FVC % predicted (mean, SE) | 98.2(0.8) | 94.8(1.1) | 0.0261 |
 FEV1% predicted (mean, SE) | 82.0(0.9) | 78.0(1.1) | 0.0105 |
GOLD categories (%) | Â | Â | 0.0782 |
 Mild (FEV1 ≥ 80%) | 56.9 (51.0 ,62.6) | 47.3 (41.3, 53.4) |  |
 Moderate (FEV1 50–79%) | 37.9 (32.8 ,43.3) | 45.1 (39.0, 51.4) |  |
 Severe-to-very severe (FEV1 < 50%) | 5.2 (3.3 ,8.0) | 7.6 (5.2, 11.1) |  |