Comparison of definitions by level of obstruction# in the older current and ex-smoker subgroup¶
| LLN cut-off | Total | |||
| Moderate-to-very severe+ | Mild§ | Noneƒ | ||
| Fixed cut-off | ||||
| Moderate-to-very severe## | 1552 | 100 | 571 | 2223 |
| Mild¶¶ | 0 | 78 | 199 | 227 |
| None++ | 0 | 0 | 3516 | 3516 |
| Total | 1552 | 178 | 4286 | 6016 |
LLN: lower limit of normal (i.e. sd score of <-1.645). #: based on post-bronchodilator forced expiratory volume in one second (FEV1)/forced vital capacity (FVC) and FEV1; ¶: 6,016 current or ex-smokers aged ≥50 yrs; +: FEV1/FVC<LLN and FEV1<LLN; §: FEV1/FVC<LLN and FEV1≥LLN; ƒ: FEV1/FVC≥LLN; ##: FEV1/FVC <0.70 and FEV1 <80% of predicted value; ¶¶: FEV1/FVC <0.70 and FEV1 ≥80% pred; ++: FEV1/FVC ≥0.70.