Table 1.
Descriptive statistics for the diagnostic classifications for typically developing (TD) and Down syndrome (DS) groups. The diagnostic classifications are Normal Hearing (NH), Conductive Hearing Loss (CHL), and Pressure Equalizing Tubes (PET). Single frequency tympanometry (0.226-kHz probe) variables are given for each group and category: Equivalent Volume of the ear canal (Veq); Tympanometric Peak Pressure (TPP); Peak compensated static admittance at +200 daPa (SA +200); Tympanometric width (TW); Wideband acoustic reflex threshold (WB ART).
| Subgroup | Age (mos.) | Veq (ml) | TPP (daPa) | SA +200 (mmho) | TW (daPa) | WB ART (dB SPL) | |
|---|---|---|---|---|---|---|---|
| DS NH (n=21) | AVE | 94.6 | 0.60 | −31.67 | 0.54 | 99.67 | 82.50 |
| SD | 41.2 | 0.25 | 75.43 | 0.53 | 46.75 | 14.82 | |
| DS CHL (n=25) | AVE | 53.9 | 0.46 | −138.54 | 0.31 | 134.29 | 82.17 |
| SD | 39.6 | 0.14 | 103.24 | 0.44 | 95.52 | 17.98 | |
| DS PET (n=26) | AVE | 90.5 | 1.64 | * | * | * | 80.60 |
| SD | 67.9 | 0.78 | * | * | * | 19.55 | |
| TD NH (n=36) | AVE | 79.4 | 0.78 | −20.00 | 0.72 | 86.20 | 73.86 |
| SD | 44.5 | 0.18 | 40.12 | 0.48 | 35.11 | 14.61 | |
| TD CHL (n=16) | AVE | 11.8 | 0.43 | −27.19 | 0.13 | 75.00 | 80.63 |
| SD | 3.4 | 0.06 | 39.34 | 0.23 | 93.34 | 9.64 | |
| TD PET (n=34) | AVE | 67.9 | 2.15 | * | * | * | 81.21 |
| SD | 57.2 | 1.38 | * | * | * | 11.18 |
*
Not measurable due to PET.