Table 1.

Clinical features differentiating chronic obstructive pulmonary disorder and asthma

Chronic obstructive pulmonary disorderAsthma
Smoker or ex-smokerNearly allPossibly
Symptoms under the age of 35 yearsRareOften
Chronic productive coughCommonUncommon
BreathlessnessPersistent and progressiveVariable, often over short time periods
Night-time waking with breathlessness and/or wheezeUncommonCommon
Significant diurnal or day-to-day variability of symptomsUncommonCommon