Table 2.1.2. Recommended initial tympanometric screening test criteria.
| Infantsa | One year to school ageb |
|---|---|
| Ytm<0.2 mmho | Ytm<0.3 mmho1 |
| or TW>235 daPa | or TW>200 daPa |
Legend: mmho = millimho; daPa = decaPascal; TW = tympanometric width; Ytm = peak admittance
[a] Infants: Roush, Bryant, Mundy, Zeisel, and Roberts, 1995
[b] Older Children: Nozza, Bluestone, Kardatzke, and Bachman, 1992; 1994
[1] For children >6 years of age, when using ±400 daPa for compensation of ear canal volume, Ytm<0.4 mmho is the recommended criterion.