Table 4

Otodynamics recordings for the right and left ear (SIDS vs controls)

FrequencyMeasureSIDS (n=24)Controls (n=98)P value*
Median (IQR)Median (IQR)
Right ear
 1 kHzSignal−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
Confidence14.5% (5.0% to 35.0%)14.0% (4.0% to 43.0%)0.90
 1.5 kHzSignal+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
Confidence63.5% (46.5% to 88.5%)53.5% (29.0% to 74.25%)0.15
 2 kHzSignal+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
Confidence84.0% (75.0% to 96.25%)84.0% (70.75% to 93.0%)0.72
 3 kHzSignal+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
Confidence90.0% (82.75% to 97.75%)86.0% (82.0% to 94.25%)0.27
 4 kHzSignal+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
Confidence94.5% (85.25% to 98.0%)90.5% (81.0% to 97.0%)0.20
Left ear
 1 kHzSignal−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
Confidence12.5% (5.25% to 39.5%)27.0% (8.5% to 53.25%)0.10
 1.5 kHzSignal+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
Confidence67.5% (35.25% to 81.0%)60.0% (34.75% to 78.5%)0.15
 2 kHzSignal+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
Confidence86.0% (73.0% to 94.5%)84.00 (73.75% to 95.0%)0.80
 3 kHzSignal+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
Confidence93.0% (82.75% to 98.0%)90.0% (81.0% to 96.25%)0.31
 4 kHzSignal+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
Confidence94.5% (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.