Table 4. Postoperative audiological gain in middle-aged patients.

CWU, canal wall up; CWD, canal wall down; AB, air-bone

Surgical procedure	Time point	Mean preoperative AB gap (dB)	SD (±)	Mean postoperative AB gap (dB)	Mean audiological gain (dB)	SD (±)
CWU	3 months	31.67	3.37	39.97	8.30	3.06
	6 months	31.67	3.37	39.77	8.10	3.19
	9 months	31.67	3.37	39.87	8.20	3.04
CWD	3 months	33.52	3.12	39.92	6.40	3.43
	6 months	33.52	3.12	39.64	6.12	3.55
	9 months	33.52	3.12	39.62	6.10	3.76
Total (CWU + CWD)	3 months	32.36	3.36	39.95	7.59	3.28
	6 months	32.36	3.36	39.68	7.32	3.42
	9 months	32.36	3.36	39.74	7.38	3.43