Table 2. Differences in impedance and ETFT between the two groups

	Normal (SD)	Unilateral COM (SD)	t
E.V	1.22 (0.338) cm3	1.06 (0.273) cm3	2.073
S.C	0.51 (0.221) mmho	0.73 (0,406) mmho	−2.927†
Atmospheric pressure ETFT	−5.20 (10.901) daPa	−9.52 (24.758) daPa	0.993‡
Postive pressure ETFT	−16.85 (11.356) daPa	−23.70 (22.908) daPa	1.661‡
Negative pressure ETFT	5.53 (19.407) daPa	−0.36 (36.608) daPa	0.879*

p<.05,
p<.01
p<.001.
SD: standard deviation, ETFT: eustachian tube function test.