In conventional therapy, the therapist performed chest percussions and vibrations in the postural drainage positions as per the evaluation findings. The percussions were administered with a layer of cloth as an interface between the therapist’s cupped hands and subject’s thoracic cage. Vibrations were given following percussions. Both percussions and vibrations were performed as per the conventional standards. Deep breathing exercises and relaxation positions were given after termination of therapy. ACBT was performed in the postural drainage positions as per the evaluation. Technique followed was as per Pryor & Webber (7). Treatment was terminated when the patient was treated for a maximum of 30 min in each postural drainage position, the patient was no longer expectorating sputum or when the patient became too tired to continue treatment. Sputum expectorated during and after the therapy techniques was collected for 24 h in a secured container. PFTreadings were obtained at the end of the third session of each therapy. Three efforts were allowed and the best of the three values was considered. A visual analogue scale (VAS) was used to quantify the ‘‘comfort’’ component during both the therapy sessions. The VAS was a 10-cm line with endpoints defined as ‘‘uncomfortable’’ and ‘‘comfortable’’ on either end. The weight of sputum expectorated was measured using the calibrated electronic balance (Citizen, Model No: MP 200; manufactured 2006, India) accurate to 0.01 g. Wet sputum volume was measured using calibrated measuring cups under all universal precautions. Measured sputum was disposed of as per the regulations of the respective hospitals. A minimum washout period of 12 h was maintained between the two therapy arms and the patients were crossed over to the next therapy arm.