Table 3.

Mean deviation (MD) and pattern standard deviation (PSD)

	Baseline	1 year	2 years	3 years	P value
MD value	−5.4 ± 4.7 dB	−4.4 ± 4.4 dB	−4.7 ± 4.7 dB	−4.5 ± 4.4 dB	0.107
PSD value	7.4 ± 4.2 dB	6.9 ± 4.3 dB	7.2 ± 4.7 dB	7.9 ± 4.8 dB	0.057