Guidelines for Audiologic Screening

Table 2.1.1. Equivalent ear canal volume measures for children 1 to 7 years of age prior to and following placement of tympanostomy tubes.1

90% range for ears with and without tubes	Pretube	Post-tube
Fifth percentile—95th percentile	0.3–0.9 cm³	1.0–5.5 cm³

[1] Shanks, Stelmachowicz, Beauchaine, and Schulte, 1992.