The CBT treatment was associated with significant and sustained improvements in psychological functioning but did not improve fluency.

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The proposed graphical method of assessing agreement can be used alongside other measures such as ICC for reporting on reproducibility in studies of multiple observers making continuous measurements.

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This trial confirmed the viability of the webcam Lidcombe Program intervention. It appears to be as efficacious and economically viable as the standard, clinic Lidcombe Program treatment.

The aims of future research should be to improve research design, increase statistical power, employ multidimensional measures of anxiety, and further develop anxiolytic treatment options for people who stutter.

Webcam-delivered Lidcombe Program intervention is potentially efficacious, is practical and viable, and requires further exploration with comparative clinical trials and a qualitative study of parent and caregiver experiences.