Table 6
Frequency of residents’ noise reports with AM, and AM depth. Noise reports are grouped by self-stated audibility of WT sounds, and level of annoyance (LoA). LoA is measured on a scale of 0 (not at all annoyed) to 4 (very annoyed). M = mean, SEM = standard error of the mean. F, p, η2: test statistics for analysis of variance.
| AM (IOA) | Noise reports | Test statistic | |||
|---|---|---|---|---|---|
| 50–200 Hz | No noise | LoA = 0 | LoA = 1 | LoA ≥ 2 | |
| Not detected | 115 | 13 | 16 | 21 | |
| 92.7% | 76.5% | 94.1% | 67.7% | ||
| Detected | 9 | 4 | 1 | 10 | |
| 7.3% | 23.5% | 5.9% | 32.3% | ||
| Maximum AM depth (dB) | M = 0.34 | M = 0.98 | M = 0.30 | M = 1.57 | F(3) = 5.72 |
| SEM = 0.14 | SEM = 0.38 | SEM = 0.38 | SEM = 0.28 | p < 0.001, η2 = 0.09 | |
| Range (when detected) | 3–6 | 3–5 | 5 | 3–7 | |
| AM (SPP) | |||||
| Not detected | 123 | 16 | 16 | 31 | |
| 99.2% | 94.1% | 94.1% | 100.0% | ||
| Detected | 1 | 1 | 1 | 0 | |
| 0.8% | 5.9% | 5.9% | 0.0% | ||
| Maximum SPP (dB) | M = 0.57 | M = 0.64 | M = 0.79 | M = 0.68 | F(3) = 1.13 |
| SEM = 0.04 | SEM = 0.17 | SEM = 0.24 | SEM = 0.09 | p = 0.340, η2 = 0.02 | |
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