Updraft II was consistently the most efficient nebulizer, while the WJ was consistently the least efficient.
The differences between the Misty-Neb or the Acorn II and the Updraft II were not large, but all three types of nebulizer were strikingly more efficient than the WJ.
DV was higher for saline than for the 4 ml medication charges, which were virtually identical.
The Updraft II produced the highest mean RF and a low mean DV, while the WJ produced the lowest mean RF and the highest mean DV.
The Updraft II had the best recorded nebulisation time.
The Updraft II yielded the largest estimated pulmonary drug deposition (DE) for each drug trial, while the WJ consistently yielded the lowest.