Frequency (Hz) | r for BC at 1 month | r for BC at 3 months | r for BC at 6 months |
500 | 0.154 | 0.122 | 0.158 |
1000 | 0.587 | 0.118 | 0.144 |
2000 | 0.264 | 0.209 | 0.19 |
4000 | 0.202 | 0.138 | 0.184 |