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| Characteristics | GOLD Category | ||||
| At Risk | 1 | 2 | 3 | 4 | |
| (n = 56) | (n = 38) | (n = 58) | (n = 64) | (n = 18) | |
| Age | 59.1±7.2 | 62.1±8.0 | 61.7±7.2 | 62.5±7.1 | 60.6±6.5 |
| Sex | |||||
| Male | 25 (45%) | 22 (58%) | 29 (50%) | 33 (52%) | 7 (39%) |
| Female | 31 (55%) | 16 (42%) | 29 (50%) | 31 (48%) | 11 (61%) |
| Current Smoker | 30 (54%) | 27 (71%) | 43 (74%) | 41 (64%) | 8 (44%) |
| FEV1 (%) | 98.4±13.0 | 92.1±8.4 | 67.2±8.0 | 40.9±5.9 | 23.8±4.8 |
| FEV1/FVC (%) | 76.9±4.5 | 63.5±4.3 | 59.6±7.5 | 44.2±7.3 | 32.7±6.5 |
