Basic characteristics of the disease subgroups in the 2012 Tasmanian Longitudinal Health Study study (general sample)
| No airways disease (n=2367)# | Asthma | COPD | ACO | ||
| Reference sample | Others | ||||
| Participants | 552 | 1815 | 148 | 88 | 43 |
| Age years | 52.5±0.8 | 52.7±0.8 | 52.9±0.8 | 52.8±0.7 | 52.8±0.8 |
| BMI kg·m−2 | 27.7±5.1 | 28.8±5.4 | 30.3±6.7 | 27.1±5.8 | 28.8±7.2 |
| Female | 285 (52) | 937 (52) | 77 (52) | 43 (49) | 19 (44) |
| Smoking history | |||||
| Never | 549 (100) | 567 (32) | 77 (53) | 15 (17) | 8 (19) |
| Former | 909 (51) | 56 (38) | 24 (28) | 17 (40) | |
| Current | 324 (18) | 13 (9) | 48 (55) | 18 (42) | |
| Asthma history | |||||
| Early-onset | 75 (51) | 19 (44) | |||
| Current ICS use | 76 (51) | 1 (1) | 18 (42) | ||
| Asthma severity | |||||
| Intermittent | 17 (13) | 1 (4) | |||
| Mild persistent | 33 (25) | 8 (29) | |||
| Moderate–severe persistent | 82 (62) | 19 (68) | |||
| Pre-BD spirometry | |||||
| FEV1 % pred | 102.0±11.8 | 98.7±13.2 | 91.6±15.1 | 78.5±15.1 | 64.7±18.8 |
| FVC % pred | 102.5±11.8 | 100.6±12.4 | 96.7±14.5 | 99.6±15.3 | 90.0±18.7 |
| FEV1/FVC % pred | 99.2±6.1 | 97.9±6.5 | 94.5±7.4 | 78.3±8.4 | 70.7±11.5 |
| Post-BD spirometry | |||||
| FEV1 % pred | 104.8±11.8 | 101.9±12.8 | 96.0±13.8 | 82.5±14.3 | 72.4±19.0 |
| FVC % pred | 102.3±11.7 | 100.8±12.1 | 98.1±13.4 | 102.8±14.9 | 96.7±17.5 |
| FEV1/FVC % pred | 102.2±5.2 | 100.8±6.0 | 97.8±6.4 | 79.8±7.0 | 73.8±11.6 |
| BDR indices | |||||
| ΔFEV1 mL | 91.9±121.0 | 102.1±132.2 | 145.7±159.3 | 127.5±199.2 | 257.4±188.0 |
| ΔFEV1 % of initial FEV1 | 2.9±3.7 | 3.4±4.4 | 5.4±6.7 | 6.0±8.8 | 13.5±11.6 |
| ΔFEV1 % of predicted FEV1 | 2.8±3.6 | 3.1±3.9 | 4.4±4.9 | 4.0±6.1 | 7.7±5.1 |
Data are presented as n, mean±sd or n (%). Complete data were obtained in 2625 (99%) for smoking history, 160 (84%) for asthma severity. ACO: asthma–COPD overlap; BMI: body mass index; ICS: inhaled corticosteroid; BD: bronchodilator; FEV1: forced expiratory volume in 1 s; FVC: forced vital capacity; BDR: bronchodilator reversibility. #: reference sample criteria: never-asthma, never-smoker, no respiratory symptoms in the past 12 months.