Compared to 4 weeks in a conventional phase with a 2-week washout what was the result of HFCWO (SmartVest®) device on spirometry values (Forced expiratory volume during the first second (FEV1) or Forced Vital Capacity  (FVC))?
There was no significant change in spirometry values (FEV1 or FVC) with HFCWO baseline FEV1 1.05 (SD 0.37) versus postintervention FEV1 1.07 (SD 0.38) L or in the conventional phase (baseline FEV1 0.97 [SD 0.37]) versus postintervention (FEV1 1.01 [SD 0.36] L, P = not significant), as shown in Figure 2.