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The seasonal effects in each defined geographical zone on ΔMD, the change in Mean Deviation since the previous visit, restricted to participants below 60 years old at study entry.
| Zone | Magnitude of seasonal effect (dB) |
Date of peak | Statistical significance of magnitude (p) |
|---|---|---|---|
| Atlantic | 0.07 | 15 Feb | 0.001 |
| Central | 0.10 | 10 Mar | <0.001 |
| North | 0.23 | 3 Feb | <0.001 |
| Pacific Northwest |
0.05 | 5 May | 0.055 |
| Southeast | 0.03 | 13 Apr | 0.164 |
| West | 0.06 | 3 Feb | <0.001 |
