| Frequency (kHz) | Table Column Head | ||
| Time of the Day | Trend Coefficient | Correlation Coefficient | |
| 37.5 | Day | −0.00082 | 0.34 |
| 37.5 | Night | 0.000474 | 0.21 |
| 45.9 | Day | 0.000615 | 0.22 |
| 45.9 | Night | 0.000474 | 0.17 |