Table III. Mean, standard deviation and range of air-bone gap closure (difference between pre- and post-operative ABG) for all revisions and for stapedectomy and stapedotomy clusters.

	Mean ABG closure	SD	Range
All revisions	15.93 dB	± 11.95 dB	- 3.75-53.75
Stapedectomy	14.93 dB	± 13.45 dB	- 4.5-53.75
Stapedotomy	16.86 dB	± 10.75 dB	0-38.75