2. Data collection. Demographic information such as age, race, duration of asthma symptoms, number of previous hospitalizations, and current medication will be collected on an ED data collection form. Pertinent exam findings such as patient's vital signs, pulse oximetry, peak flow, Pediatric asthma severity score (PAS), patient asthma severity self-assessment sheets (PSAS), and ED treatment will also be collected on an ED data collection form.