Table 2.

Comparison of mean response amplitudes obtained by DP-OAEs between the two groups (Mann-Whitney U test)

Frequency (Hz)		Smoking status	Response amplitude (dBA)			Mean ranks	Z	P value
			Mean	SD*	Median
1000	RE***	S**	10.41	3.86	10	80.92	−6.22	<0.001
		NS+	13.39	2.77	15	128.07
	LE****	S	10.41	3.72	10	81.68	−6.01	<0.001
		NS	13.21	3.11	15	127.44
2000	RE	S	4.89	6.61	5	80.49	−5.90	<0.001
		NS	9.47	5.31	10	128.44
	LE	S	5.00	5.68	5	80.64	−5.69	<0.001
		NS	9.07	6.46	10	126.84
3000	RE	S	−1.08	7.36	0	88.26	−4.08	<0.001
		NS	3.21	7.43	5	121.88
	LE	S	−1.28	6.62	0	80.25	−5.86	<0.001
		NS	4.03	6.64	5	127.91
4000	RE	S	−11.54	10.31	−15	69.15	−8.22	<0.001
		NS	1.91	10.22	5	138.00
	LE	S	−9.12	9.89	−10	71.81	−7.63	<0.001
		NS	2.56	9.89	5	135.76
6000	RE	S	−15.87	10.23	−20	69.35	−8.18	<0.001
		NS	−2.21	10.49	0	137.84
	LE	S	−15.92	9.95	−20	69.09	−8.24	<0.001
		NS	−2.73	10.55	0	138.06
8000	RE	S	−13.19	12.64	−15	75.23	−6.92	<0.001
		NS	−1.78	11.08	0	132.88
	LE	S	−11.80	13.38	−10	81.51	−5.28	< 0.001
		NS	−2.50	11.21	0	125.35

*SD = Standard deviation. **S = Smoker, ⁺NS = Nonsmoker, ***RE = Right ear, ****LE = Left ear