In the case of rhonchi (Fig. 10c), it can be seen that this is the class closest to the wheezes and it is most often confused with them. The class of inspiratory and expiratory wheezes is marked almost as often as the rhonchi class, which was the correct answer here. Additionally, for the rhonchi class a louder breath sound and prolonged expiration phase were also often marked.
In general, comparing the results in Figs. 10a and 10c, it can be concluded that wheezes and rhonchi groups are subjectively close to each other and are often confused with similar acoustic features. Fig. 10c. shows that in sound samples which contained rhonchi, according to the standard, the respondents mistook them mainly for the class of wheezes. At the same time (Fig. 7), it can be seen that the class of rhonchi was also often chosen when the standard response was medium or coarse crackles, and thus the rhonchi class possesses the acoustic features characteristic for the crackles class, causing confusion among the participants. Finally, it can be stated that the class of rhonchi is quite ambiguous and differently classified by the respondents due to the fact that it has the features of both wheezes and crackles.