The patient is in late 30s.

He/she constantly asked people to repeat themselves due to tinnitus and hearing impairment for about 5 years.

You can see that the number was reduced by 15 in 6K and 8K after treatment compared to before treatment.

This means there was a hearing improvement of 15 decibels.

(A change of more than 5 decibels is considered significant because it is outside the tolerance range.)