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This study examines the relationship among psychosocial factors, asthma symptoms, and peak expiratory flow rate (PEFR) in the natural environment. Twenty adult asthmatics wore preprogrammed wristwatches that prompted them to assess PEFR, asthma symptoms, and psychosocial factors five times a day for 10 days. Psychosocial variables (activities, locations, social contacts, mood, and stressors) were...