Otodynamics recordings for the right and left ear (SIDS vs controls)
| Frequency | Measure | SIDS (n=24) | Controls (n=98) | P value* |
| Median (IQR) | Median (IQR) | |||
| Right ear | ||||
| 1 kHz | Signal | −2.70 (−9.65 to +6.35) | −1.40 (−6.43 to +5.23) | 0.62 |
| Noise | +7.70 (+1.20 to +11.08) | +7.05 (+1.80 to +12.43) | 0.47 | |
| SNR | −7.75 (−12.98 to −2.60) | −8.00 (−13.63 to −1.30) | 0.93 | |
| Confidence | 14.5% (5.0% to 35.0%) | 14.0% (4.0% to 43.0%) | 0.90 | |
| 1.5 kHz | Signal | +9.30 (+5.98 to +14.08) | +8.45 (+2.28 to +11.00) | 0.25 |
| Noise | +6.80 (−0.08 to +11.05) | +6.60 (+2.38 to +12.38) | 0.91 | |
| SNR | +2.45 (−0.63 to +8.80) | +0.55 (−3.85 to +4.70) | 0.16 | |
| Confidence | 63.5% (46.5% to 88.5%) | 53.5% (29.0% to 74.25%) | 0.15 | |
| 2 kHz | Signal | +11.25 (+8.75 to+15.63) | +12.10 (+7.43 to 16.50) | 0.92 |
| Noise | +4.25 (−1.40 to +8.08) | +4.15 (−0.90 to +7.83) | 0.85 | |
| SNR | +7.25 (+4.83 to +14.73) | +7.10 (+3.85 to +11.33) | 0.71 | |
| Confidence | 84.0% (75.0% to 96.25%) | 84.0% (70.75% to 93.0%) | 0.72 | |
| 3 kHz | Signal | +17.15 (+12.53 to +20.58) | +15.00 (+0.18 to +20.38) | 0.26 |
| Noise | +6.00 (+1.73 to +8.50) | +4.20 (+1.75 to +7.90) | 0.56 | |
| SNR | +9.50 (+6.73 to +17.10) | +8.05 (+6.40 to +12.45) | 0.29 | |
| Confidence | 90.0% (82.75% to 97.75%) | 86.0% (82.0% to 94.25%) | 0.27 | |
| 4 kHz | Signal | +13.00 (+7.98 to +20.43) | +11.05 (+6.40 to +16.33) | 0.20 |
| Noise | +2.25 (−1.75 to +4.68) | +0.50 (−2.43 to +3.68) | 0.35 | |
| SNR | +12.40 (+7.78 to +17.20) | +9.85 (+6.28 to +15.00) | 0.18 | |
| Confidence | 94.5% (85.25% to 98.0%) | 90.5% (81.0% to 97.0%) | 0.20 | |
| Left ear | ||||
| 1 kHz | Signal | −6.95 (−12.20 to +0.43) | −0.10 (−5.43 to +5.40) | 0.004 |
| Noise | +2.70 (+0.55 to +6.28) | +6.35 (+0.50 to +11.13) | 0.023 | |
| SNR | −8.55 (−12.23 to −1.90) | −4.35 (−10.70 to +0.63) | 0.11 | |
| Confidence | 12.5% (5.25% to 39.5%) | 27.0% (8.5% to 53.25%) | 0.10 | |
| 1.5 kHz | Signal | +5.50 (+3.58 to +10.73) | +8.05 (+3.98 to +11.00) | 0.33 |
| Noise | +3.40 (+0.75 to +9.00) | +6.90 (+2.93 to +10.83) | 0.06 | |
| SNR | +3.20 (−2.60 to +6.38) | +1.75 (−2.65 to +5.53) | 0.54 | |
| Confidence | 67.5% (35.25% to 81.0%) | 60.0% (34.75% to 78.5%) | 0.15 | |
| 2 kHz | Signal | +9.25 (+4.93 to +16.78) | +11.10 (+7.38 to 14.80) | 0.63 |
| Noise | +2.40 (−2.65 to +4.53) | +2.05 (−0.53 to +6.10) | 0.50 | |
| SNR | +7.90 (+4.43 to +12.28) | +7.10 (+4.55 to +13.23) | 0.79 | |
| Confidence | 86.0% (73.0% to 94.5%) | 84.00 (73.75% to 95.0%) | 0.80 | |
| 3 kHz | Signal | +16.35 (+10.35 to +20.33) | +13.30 (+8.95 to +18.30) | 0.23 |
| Noise | +3.20 (+0.78 to +4.70) | +2.45 (−0.13 to +5.53) | 0.53 | |
| SNR | +11.25 (+6.89 to +17.65) | +9.55 (+6.30 to +14.50) | 0.28 | |
| Confidence | 93.0% (82.75% to 98.0%) | 90.0% (81.0% to 96.25%) | 0.31 | |
| 4 kHz | Signal | +14.20 (+6.53 to +17.28) | +10.70 (+5.73 to +15.63) | 0.25 |
| Noise | −0.70 (−2.35 to+2.80) | −0.75 (−3.00 to+2.43) | 0.74 | |
| SNR | +12.45 (+6.78 to +16.50) | +10.80 (+6.20 to +15.40) | 0.38 | |
| Confidence | 94.5% (82.75% to 98.0%) | 92.5% (81.0% to 97.0%) | 0.42 | |
Signal, noise and SNR measured in dB.
*Mann-Whitney U test.
SIDS, sudden infant death syndrome; SNR, signal to noise ratio.