Table 4.
Zone | Magnitude of seasonal effect (dB) |
Date of peak | Statistical significance of magnitude (p) |
---|---|---|---|
Atlantic | 0.31 | 25 Jan | <0.001 |
Central | 0.22 | 10 Feb | <0.001 |
North | 0.21 | 28 Jan | <0.001 |
Pacific Northwest |
0.14 | 19 Jan | 0.023 |
Southeast | 0.25 | 6 Feb | <0.001 |
West | 0.39 | 4 Feb | <0.001 |