Late-acquired sounds, such as /r/ are difficult to learn and many children experience persistent errors on these sounds. The purpose of the present study is to determine whether treating these sounds earlier in the child's life may result in better outcomes.
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Treatment Efficacy: Number of correct productions of treated speech sounds in treatment words
Timeframe: baseline until accuracy criterion is met; up to 18 weeks after final baseline session
Treatment Efficiency: Number of sessions required to meet accuracy criteria
Timeframe: baseline until accuracy criterion is met; up to 18 weeks after final baseline session
Session Length: Mean duration of sessions in minutes
Timeframe: First treatment session until final treatment session. Final treatment session occurs when accuracy of treatment sound is met (90% accuracy across three consecutive sessions or a maximum of 35 treatment sessions)