Characterization of middle-ear condition of Oporto daycare children up-to 3 years-old: a cross sectional study.

Objective: The aim of this study was to determine tympanometric values of children who attend Oporto daycare centers and further analyze any relations with host and environmental factors.

Methods: Cross sectional study in a randomly selected sample of 117 daycare children up-to 3-years old from Oporto. Tympanometric measures were collected.