Figure 1From: High frequency chest wall oscillation for asthma and chronic obstructive pulmonary disease exacerbations: a randomized sham-controlled clinical trialFlowchart of Study Cohort. N = 94 adults (age 18 years and older) admitted with a physician-diagnosis of acute asthma or COPD and with FEV1/FVC < 70% at the time of screening were assessed for eligibility. Fifty-two (55%) were randomized to active HFCWO (n = 25) or sham HFCWO (n = 27).Back to article page