Table 5.

Comparison of click-evoked otoacoustic emissions levels for overall response and particular click-evoked otoacoustic emissions frequencies (mean ± standard deviation) in three age groups

Click-evoked otoacoustic emissions	10–25 years	26–40 years	41–60 years	P (10–25 years versus 26–40 years)	P (10–25 years versus 41–60 years)	P (26–40 years versus 41–60 years)
Overall response	12.3±4.1	12.6±4.2	10.4±3.3	0.64	0.02	0.01
1,000 Hz	10.2±5.8	9.9±5.7	7.4±3.9	0.66	0.00	0.01
2,000 Hz	10.9±5.5	11.1±4.7	9.2±4.6	0.72	0.04	0.02
3,000 Hz	7.6±5.8	7.6±5.2	5.3±4.3	0.98	0.01	0.01
4,000 Hz	6.1±5.7	4.9±5.4	3.2±4.2	0.10	0.00	0.07
5,000 Hz	4.0±6.7	1.3±3.4	3.3±5.0	0.01	0.56	0.11

Notes: The P-values refer to comparisons between the age subgroups; significant differences are presented in bold.