TABLE II.
Comparison Data (MRT and STI).
| Facepiece | Listener 1 Std Dev |
Listener 2 Std Dev |
Listener 3 Std Dev |
Pooled Std Dev Across Listeners |
|---|---|---|---|---|
| 3M FR-M40 | 8.0 | 11.6 | 6.0 | 8.5 |
| Avon C50 | 10.2 | 10.9 | 3.5 | 8.2 |
| Peltor M-TAC | 7.4 | 5.8 | 9.8 | 7.7 |
| Drager CDR 4500 | 6.8 | 5.7 | 6.5 | 6.3 |
| MSA Millenium | 8.5 | 2.6 | 9.4 | 6.8 |
| Survivair Optifit | 9.6 | 13.6 | 5.3 | 9.5 |
| MSA Ultra Elite | 5.0 | 1.9 | 10.0 | 5.6 |
| Scott M120 | 5.4 | 5.5 | 7.0 | 6.0 |
| North 5400 | 6.5 | 9.7 | 8.2 | 8.1 |
| 3M FR 7800B | 7.4 | 7.9 | 11.6 | 9.0 |
| Scott M110 | 8.3 | 4.4 | 9.4 | 7.4 |
| Avon FM12 | 3.1 | 5.9 | 7.4 | 5.5 |
| Pooled Std Dev | 7.4 | |||
| *Data aggregated from Coyne and Barker(24) Tables: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, |
| Facepiece | Test Run |
Mean | St Dev |
|---|---|---|---|
| 1A | 1 | 0.538 | 0.014 |
| 1A | 2 | 0.555 | 0.012 |
| 1A | 3 | 0.535 | 0.012 |
| 1A | 4 | 0.514 | 0.018 |
| 1A | 5 | 0.553 | 0.017 |
| 1A | 6 | 0.540 | 0.012 |
| 1A | 7 | 0.531 | 0.014 |
| 2A | 1 | 0.535 | 0.024 |
| 2A | 2 | 0.567 | 0.014 |
| 2A | 3 | 0.536 | 0.012 |
| 2A | 4 | 0.519 | 0.013 |
| 2A | 5 | 0.553 | 0.012 |
| 2A | 6 | 0.544 | 0.016 |
| 2A | 7 | 0.539 | 0.015 |
| 3A | 1 | 0.547 | 0.018 |
| 3A | 2 | 0.550 | 0.013 |
| 3A | 3 | 0.537 | 0.010 |
| 3A | 4 | 0.533 | 0.010 |
| 3A | 5 | 0.549 | 0.012 |
| 3A | 6 | 0.543 | 0.011 |
| 3A | 7 | 0.525 | 0.011 |
| pooled std dev | 0.014 | ||
| Pooled difference between means | 0.016 | ||
| * Data from Symons [2012] Table 2 |