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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 2.

Statistical results of linear mixed repeated measures model for corrected age at testing, gestational age at birth, nursery group, and race on wideband ambient and tympanometry variables. Significance levels found in analysis: 1p <0.05, 2p <0.01, 3p <0.001, 4p <0.0001. If only one notation is given for a group of variables, they all reached the same level of significance.

Outcomes Corrected Age Gestational Age NICU Race Corrected
Age * Race
Ambient
Absorbance 		40.25,
0.35, 0.5,
0.7, 1,
1.4,
2,3,4,6,8
kHz		 14,36,48 kHz 24,6 kHz
Ambient Group
Delay 		40.25,0.35
,0.5,0.7,
11,
1.4,2,33,
44,6,8
kHz		 10.35,1.4,2 kHz 26 kHz 26 kHz 16 kHz
Downswept
Absorbance
TPP 		40.25,
0.35, 0.5,
0.7, 1,
1.4,
2,3,4,6,8
kHz		 10.25,
20.35,10
.5 kHz		 26,8
kHz		 26 kHz
Downswept
Absorbance
+200 daPa 		40.25,
0.35, 0.5,
0.7, 1,
1.4,
2,3,4,6,8
kHz		 11.4,3 kHz 24,46,28 kHz
Downswept
Absorbance
−300 daPa 		40.25,
0.35, 0.5,
0.7, 1,
1.4,
2,3,4,6,8
kHz		 40.25,11.4 kHz 14,26,8
kHz		 14,26,18
kHz		 24,6 kHz
Downswept
Group Delay
TPP 		40.25,
20.35, 0.5,
0.7, 41,
1.4, 2,3,4
kHz		 32,13 kHz 12,3,26,
8 kHz
Downswept
Group Delay
+200 daPa 		40.25,0.5,
0.7,4,26,
48 kHz		 20.35
kHz		 18 kHz
Downswept
Group Delay
−300 daPa 		40.25,
0.35, 30.5,
0.7, 21, 42,
3,14,46
kHz		 21,11,4,3 kHz 11 kHz
Upswept
Absorbance
TPP 		40.25,0.35
,0.5,0.7,1,
1.4,
2,3,4,6, 8
kHz		 18 kHz 11,4,26,3
8 kHz
Upswept
Absorbance
+200 daPa 		40.25,0.35
,0.5,0.7,1,
1.4,
2,3,4,6, 8
kHz		 13 kHz 24,36,28
kHz
Upswept
Absorbance
−300 daPa 		40.25,0.35
,0.5,0.7,1,
1.4,2,3,4,
6, 8 kHz		 11,1.4,8 kHz 14,26, 18
kHz		 14,6,8
kHz		 24,6 kHz
Upswept Group
Delay
TPP 		40.25,0.35
,0.5, 10.7,
43, 24, 16, 8
kHz		 10.25, 2,4 kHz 10.7,1,8
kHz
Upswept Group
Delay
+200 daPa 		40.25,10.3
5,40.5,0.7,
31,43, 4,
6, 8 kHz		 20.35 kHz
Upswept Group
Delay
−300 daPa 		40.25,0.35
,0.5,0.7,1,
1.4,22,33,4
4,26, 48
kHz		 21,18 kHz 21,16,28
kHz
Tympanometric
Peak Pressure
(TPP) 		4average,
d, u		 2average, d, 1u
Tympanometric
Width (TW) 		4full, p, n 2p, 1n 1n
Δ Absorbance
Low Freq. 		4p, n 1n
Δ Absorbance
High Freq. 		4p, n
Δ Group Delay
Low Freq. 		3p, 4n
Area 4 2
Length 4 1 1

Δ Absorbance is the difference in the absorbance at TPP and the absorbance at the positive (p) or negative (n) tail pressure, +200 and −300 daPa, respectively. The d denotes the downswept tympanogram, and the u denotes the upswept tympanogram. The high freq. bandwidth extends from 2 to 8 kHz; the low freq. bandwidth extends from 0.8 to 2 kHz. With the same conventions, Δ Group Delay is the difference in the group delay at TPP and the group delay at the positive (p) or negative (n) tail pressure.