Symptoms of cough, dyspnea (difficulty breathing), and wheezing occur greater than twice a week in mild persistent asthma, but do not occur every day. Symptoms may interfere minimally with daily activities. These symptoms require use of a rescue inhaler (short-acting bronchodilator) more than two times per week, but less than daily.
Symptoms wake patients from sleep three to four times per month.
Pulmonary function tests (peak expiratory flow (PEF), forced expiratory volume in one second (FEV1), and FEV1:FVC (forced vital capacity) ratio) are within normal limits of greater than 80% of predicted normal.
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