**3.2 PTA changes before and after acupuncture treatment**

Before acupuncture, mean PTA scores of improvement and no improvement groups were 63.92 ± 22.82 dB and 63.78 ± 17.99 dB, respectively and there was no statistical difference between groups (P = 0.977). After AT, mean PTA of improvement and no improvement groups were 39.55 ± 21.77 dB and 62.64 ± 18.23 dB, respectively and a significant difference between groups was evident (P = 0.000) (Fig. 2).

\* : Statistically significant difference, P<0.05 using independent-samples T test

Fig. 2. Mean PTA before and after AT between Improvement and No Improvement Groups
