Characteristics of study sample and the subgroup of older current or ex-smokers#
| Total population | Subgroup | |||
| Males | Females | Males | Females | |
| Subjects n | 6597 | 7459 | 3473 | 2543 |
| Age yrs | 54.2±15.2 | 51.9±15.1 | 64.5±8.9 | 61.9±8.3 |
| Age range % | ||||
| 21–30 yrs | 7.3 | 9.3 | ||
| 31–40 yrs | 13.9 | 15.5 | ||
| 41–50 yrs | 18.1 | 21.4 | 1.6 | 2.7 |
| 51–60 yrs | 23.5 | 23.4 | 36.4 | 47.5 |
| 61–70 yrs | 21.0 | 18.2 | 34.3 | 32.0 |
| 71–80 yrs | 13.6 | 10.1 | 23.4 | 15.5 |
| ≥81 yrs | 2.6 | 2.1 | 4.4 | 2.2 |
| Height m | 1.77±0.08 | 1.65±0.07 | 1.75±0.01 | 1.63±0.06 |
| Smoking status % | ||||
| Never-smoker | 20.3 | 35.7 | ||
| Ex-smoker | 42.8 | 28.3 | 62.3 | 53.0 |
| Current smoker | 32.9 | 32.1 | 37.7 | 47.0 |
| Missing | 4.0 | 4.0 | ||
| Respiratory symptoms %¶ | ||||
| Exercise-related dysp+ | 60.4 | 69.1 | 64.0 | 68.8 |
| Nocturnal dysp | 21.3 | 24.6 | 19.4 | 22.0 |
| Cough | 66.3 | 73.6 | 67.2 | 73.1 |
| Sputum | 61.5 | 59.2 | 62.9 | 60.9 |
| Exacerbation(s) in past year | 37.6 | 47.1 | 35.8 | 47.7 |
| FEV1 | ||||
| Pre-bronch L | 2.83±0.98 | 2.18±0.70 | 2.35±0.81 | 1.77±0.57 |
| Post-bronch L | 3.00±0.98 | 2.31±0.70 | 2.50±0.81 | 1.87±0.56 |
| Post-bronch % pred | 77.3±18.3 | 81.5±17.5 | 72.4±19.6 | 75.7±19.5 |
| FVC | ||||
| Pre-bronch L | 3.97±1.06 | 2.87±0.77 | 3.49±0.91 | 2.47±0.62 |
| Post-bronch L | 4.09±1.03 | 2.94±0.75 | 3.62±0.88 | 2.55±0.60 |
| Post-bronch % pred | 83.0±14.2 | 83.6±13.9 | 80.7±15.3 | 81.6±15.1 |
| FEV1/FVC | ||||
| Pre-bronch | 0.70±0.13 | 0.75±0.11 | 0.67±0.13 | 0.71±0.12 |
| Post-bronch | 0.73±0.13 | 0.78±0.11 | 0.68±0.13 | 0.73±0.12 |
Data are presented as mean±sd, unless otherwise indicated. dysp: dyspnoea; FEV1: forced expiratory volume in one second; bronch: bronchodilator; FVC: forced vital capacity; % pred: % predicted. #: 6,016 current or ex-smokers aged ≥50 yrs; ¶: based on a 15% (n = 2,100) random sample of study subjects; +: ≥2 on UK Medical Research Council scale.