Acoustic assessment of the voices of children using nonlinear analysis: proposal for assessment and vocal monitoring.

Objective: To analyze the accuracy of recurrence measurements, both isolated and combined, to assess the intensity of vocal disorders in children.

Method: A total of 93 children of both sexes (48 girls and 45 boys), aged between 3 and 10 years, participated. The vocal-deviation intensity was evaluated by the consensus of three speech therapists from the pronunciation of vowel /ε/ using the visual analog scale.