The utility of peak flow, symptom scores, and beta-agonist use as outcome measures in asthma clinical research.
Leone FT, Mauger EA, Peters SP, Chinchilli VM, Fish JE, Boushey HA, Cherniack RM, Drazen JM, Fahy JV, Ford J, Israel E, Lazarus SC, Lemanske RF, Martin RJ, McGeady SJ, Sorkness C, Szefler SJ. The utility of peak flow, symptom scores, and beta-agonist use as outcome measures in asthma clinical research. Chest. 2001 Apr; 119(4):1027-33.