Using a Music Therapy Collaborative Consultative Approach - World ...

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6.3.7. Reliability
Interobserver agreement data were collected on the subjects, peers and teachers
behavior. A music therapist and the investigator collected interobserver agreement
during baseline sessions (Condition A), adaptation of the playground (Condition B),
intervention session (Condition C), and peer-mediated intervention session (Condition
D). Before the baseline was started, the two observers coded the peer interaction on
playgrounds by using 10-minute videotaped recordings until they reached a mean
agreement level of greater than 85%. A second observer was trained due to the drop out
of the music therapist in the last phase of Condition C and D. Agreement between the
scores from the first and second reliability observer was calculated prior the start of the
data collection phase by using videotaped segments from previously evaluated sessions to
establish an acceptable level of agreement of greater than 85%. Reliability checks were
carried out on an average of 36.8% of total observations within each phase and for each
child. Two coders coded the videotaped segment for each target behavior. Interobserver
agreement levels for each code category were calculated by summing the number of
agreements (defined as the same coding interval) and dividing the number by sum of
agreements plus disagreements and multiplying by 100.