Description

Mild Intermittent

• Less than twice a week: cough, wheeze, chest tightness, difficulty breathing

• Brief flare-ups with varying intensity; no symptoms between flare-ups

• Less than twice a month: nighttime symptoms

• Lung function tests: FEV1 >80% normal values; peak flow <20% variability a.m.-to-a.m. or a.m.-to-p.m., day-to-day

Mild persistent

• Three to six times a week: cough, wheeze, chest tightness, difficulty breathing

• Flare-ups may affect activity level

• Three to four times a month: nighttime symptoms

• Lung function tests: FEV1 >80% normal values; peak flow <20-30% variability a.m.-to-a.m. or a.m.-to-p.m., day-to-day

Moderate persistent

• Daily: cough, wheeze, chest tightness, difficulty breathing

• Flare-ups may affect activity level

• Five or more times a month: nighttime symptoms

• Lung function tests: FEV1 >60% but <80% normal values; peak flow >30% variability a.m.-to-a.m. or a.m.-to-p.m., day-to-day

Severe persistent

• Continual: cough, wheeze, chest tightness, difficulty breathing

• Frequently: nighttime symptoms

• Lung function tests: FEV1 <60% normal values; peak flow >30% variability a.m.-to-a.m. or a.m.-to-p.m., day-to-day

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