Transition rates between smoking classes for the general and chronic obstructive pulmonary disease(COPD) population and transition rates between COPD severity stages for 2000
| Smoking transition rates# | |||
| General population | 0.8+ | 3.6§ | 6.5ƒ |
| COPD patients | 0+ | 4.7§ | 2.6ƒ |
| Severity stage transition rates¶ | |||
| Mild-to-moderate COPD | 1.8## | 2.5¶¶ | 2.1++ |
| Moderate-to-severe COPD | 3.0## | 3.7¶¶ | 3.4++ |
| Severe-to-very severe COPD | 2.6## | 3.1¶¶ | 3.0++ |
Data are presented as %, unless otherwise stated. #: mean currently observed smoking transition rates over all sex and age classes; ¶: proportion of COPD patients transitioning to another severity stage associated with yearly decline in lung function; +: start; §: quit; ƒ: restart; ##: nonsmoker; ¶¶: smoker; ++: ex-smoker.