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. Author manuscript; available in PMC: 2017 Oct 1.
Published in final edited form as: Hear Res. 2015 Dec 19;340:3–14. doi: 10.1016/j.heares.2015.12.014

Table 3.

Other tympanometric variables analyzed by age group, including Tympanometric Peak Pressure (TPP). All group delays measured in μs. Δ: Change in values relative to baseline as specified.

Outcome 95% CI
LS mean Lower Upper
Downswept
TPP (daPa)		 Age Group
   Birth −104 −124 −85
   1 month −146 −165 −127
   6 months −46 −69 −24
   9 months −65 −85 −46
   12 months −71 −93 −48
Upswept
TPP (daPa)		 Age Group
   Birth 1 −19 21
   1 month −114 −133 −95
   6 months −25 −48 −2
   9 months −39 −59 −20
   12 months −41 −64 −18
TW (daPa) Age Group
   Birth 259 241 277
   1 month 277 260 295
   6 months 212 192 232
   9 months 198 180 216
   12 months 206 186 226
TW half-width
(TPP to +200
daPa)		 Age Group
   Birth 135 121 148
   1 month 126 113 139
   6 months 82 67 97
   9 months 74 61 88
   12 months 81 66 96
TW half-width
(TPP to −300
daPa)		 Age Group
   Birth 76 67 85
   1 month 51 42 59
   6 months 85 75 95
   9 months 82 73 90
   12 months 84 74 94
Δ Low Freq
Absorbance
(+200 daPa to
TPP)		 Age Group
   Birth 0.40 0.37 0.43
   1 month 0.34 0.31 0.37
   6 months 0.27 0.24 0.31
   9 months 0.32 0.29 0.35
   12 months 0.30 0.27 0.34
Δ Low Freq
Absorbance
(−300 daPa to
TPP)		 Age Group
   Birth 0.37 0.34 0.41
   1 month 0.12 0.09 0.16
   6 months 0.22 0.18 0.26
   9 months 0.27 0.23 0.31
   12 months 0.26 0.21 0.30
Δ High Freq
Absorbance
(+200 daPa to
TPP)		 Age Group
   Birth −0.03 −0.06 −0.01
   1 month 0.05 0.02 0.07
   6 months 0.01 −0.03 0.04
   9 months 0.03 −0.01 0.05
   12 months 0.01 −0.02 0.04
Δ High Freq
Absorbance
(−300 daPa to
TPP)		 Age Group
   Birth 0.30 0.27 0.33
   1 month 0.02 −0.01 0.05
   6 months 0.10 0.06 0.13
   9 months 0.07 0.04 0.10
   12 months 0.06 0.02 0.09
Δ Low Freq
Group Delay
(μs; +200 daPa
to TPP)		 Age Group
   Birth 125 70 181
   1 month 87 34 140
   6 months 20 −43 83
   9 months 23 −32 78
   12 months −15 −78 49
Birth Group
   NICU 57 29 85
   Normal 40 −33 113
Δ Low Freq
Group Delay
(μs; −300 daPa
to TPP)		 Age Group
   Birth 235 170 300
   1 month 94 32 156
   6 months 69 −4 143
   9 months 85 20 149
   12 months 20 −54 95
Birth Group
   NICU 107 75 140
   Normal 94 9 179
Δ High Freq
Group Delay
(μs; +200 daPa
to TPP)		 Corrected Age
   Birth −71 −105 −36
   1 month −34 −67 −1
   6 months −67 −106 −28
   9 months −42 −76 −8
   12 months −27 −66 13
Birth Group
   ICU −43 −61 −26
   Normal −53 −99 −7
Δ High Freq
Group Delay
(μs; −300 daPa
to TPP)		 Age Group
   Birth 36 18 54
   1 month 37 20 55
   6 months 22 1 43
   9 months 16 −2 34
   12 months 10 −11 31
Ear Canal Area
(cm2)		 Age Group
   Birth 0.06 0.05 0.08
   1 month 0.10 0.08 0.11
   6 months 0.24 0.22 0.25
   9 months 0.25 0.23 0.26
   12 months 0.22 0.20 0.24
Ear Canal
Length (cm)		 Age Group
   Birth 1.36 1.14 1.59
   1 month 1.99 1.78 2.21
   6 months 0.97 0.71 1.23
   9 months 1.13 0.90 1.36
   12 months 1.26 1.00 1.51