Baseline characteristics of asymptomatic individuals with usable spirometry and complete data
| Men | Women | |||
| Black (n=578) | Non-black (n=2929) | Black (n=786) | Non-black (n=3196) | |
| Age (years) | 53.2 (5.9) | 54.3 (5.7) | 52.7 (5.5) | 53.7 (5.6) |
| Height (cm) | 176.1 (6.6) | 176.4 (6.4) | 163.5 (5.8) | 162.2 (5.9) |
| BMI (kg/m2) | 27.9 (4.6) | 27.4 (3.7) | 30.1 (5.8) | 26.2 (5.1) |
| Waist-hip ratio | 0.94 (0.05) | 0.96 (0.05) | 0.89 (0.08) | 0.88 (0.08) |
| Sitting height (cm) | 89.9 (3.3) | 92.9 (3.3) | 84.6 (3.2) | 86.5 (3.2) |
| Income (%) | ||||
| <$5000 | 6.7 | 0.3 | 11.7 | 0.9 |
| $5000–7999 | 5.0 | 0.7 | 7.9 | 1.3 |
| $8000–11999 | 7.4 | 1.6 | 12.1 | 4.2 |
| $12000–15999 | 10.7 | 3.7 | 10.3 | 5.4 |
| $16000–24999 | 19.2 | 10.2 | 18.2 | 14.1 |
| $25000–34999 | 15.4 | 17.4 | 13.7 | 19.0 |
| $35000–50000 | 11.2 | 24.3 | 9.8 | 21.0 |
| $50000+ | 13.8 | 38.5 | 5.9 | 29.2 |
| Not reported | 10.4 | 3.2 | 10.4 | 5.1 |
| Working status (%) | ||||
| Homemaker* | – | – | 12.2 | 23.7 |
| Employed | 80.1 | 79.1 | 77.1 | 64.7 |
| Unemployed | 3.6 | 1.3 | 2.3 | 2.0 |
| Retired | 16.3 | 19.6 | 8.4 | 9.7 |
| Most recent occupation (%) | ||||
| Managerial/professional specialty or retired | 41.0 | 53.1 | 45.3 | 54.3 |
| Technical/sales/admin support | 9.2 | 18.6 | 16.2 | 30.2 |
| Service occupations | 9.2 | 2.8 | 26.5 | 8.4 |
| Precision production/craft/repair | 15.6 | 14.5 | 0.0 | 1.5 |
| Operators/fabricators/labourers | 22.7 | 9.6 | 9.9 | 5.3 |
| Missing/other | 2.4 | 1.3 | 2.2 | 0.3 |
| Ever smoked (%) | 67.5 | 67.8 | 41.7 | 44.1 |
| Current smoker (%) | 33.6 | 17.5 | 23.9 | 18.3 |
| Pack-years of smoking (if ever smoked) | 22.6 (18.9) | 29.2 (21.8) | 15.7 (13.5) | 19.7 (16.5) |
| Education (%) | ||||
| Grade school | 18.0 | 4.7 | 10.3 | 2.9 |
| High school, did not graduate | 17.5 | 9.1 | 18.8 | 9.6 |
| High school graduate | 21.1 | 28.3 | 23.0 | 43.1 |
| Vocational school | 6.4 | 10.0 | 8.4 | 8.4 |
| College | 20.1 | 33.3 | 21.4 | 29.4 |
| Graduate/professional school | 17.0 | 14.6 | 18.1 | 6.7 |
| Systolic blood pressure (mm Hg) | 129.3 (20.3) | 119.4 (15.7) | 126.6 (20.5) | 116.3 (17.2) |
| FEV1 (l) | 3.10 (0.56) | 3.56 (0.65) | 2.34 (0.41) | 2.60 (0.44) |
| FVC (l) | 4.09 (0.67) | 4.82 (0.77) | 3.00 (0.51) | 3.45 (0.53) |
| FEV1/FVC (%) | 76.0 (6.8) | 73.9 (6.9) | 78.0 (6.1) | 75.5 (5.7) |
Values are mean (SD) or percentage.
↵* In the dataset, male subjects who reported they were homemakers were given a missing value for current working status to help preserve anonymity. Since these participants could not be identified they were not included in the analysis.
BMI, body mass index; FEV1, forced expiratory volume in 1 s; FVC, forced vital capacity.