Table 3.

Comparison of incidence of adverse reactions and hearing improvement rate of the three groups.

Group	n	Adverse reactions				Incidence of adverse reactions	Average air-bone conduction difference		Hearing improvement rate
		Reperforation	Infection	Tympanic membrane displacement	Dizziness		Preoperation	Postoperation
Otomicroscopy group	40	6	3	1	2	12 (30.00)	22.11 ± 5.89	14.72 ± 4.97	31 (77.50)
Otoendoscopy group	40	2	1	1	1	5 (12.50)∗	21.69 ± 6.44	15.42 ± 4.16	32 (80.00)
Double-lens group	40	1	0	1	1	3 (7.50)∗	22.71 ± 5.13	12.31 ± 4.21∗#	39 (97.50)∗#

Note. Compared with the otomicroscopy group, ^∗P < 0.05. Compared with the otoendoscopy group, ^#P < 0.05.