Table 3.

Autism behaviours.

Behaviour	Description	Example	Scoring procedure
Aggression to therapist (0.48 ± 0.07, 98%)	Any aggressive actions directed toward the therapist.	Hitting, kicking, biting, etc. – antisocial behaviours directed toward the therapist.	Begin coding at onset of aggressive behaviour; stop coding when the behaviour ends and action stops.
Self-injurious behaviour (0.38 ± 0.19, 94%)	Any aggressive actions or behaviours directed toward self.	Hitting, scratching, biting, etc. – behaviours directed toward self.	Begin coding at onset of self-injurious behaviour, stop coding when the behaviour ends.
Irrelevant and repetitive vocalisations (0.50 ± 0.23, 93%)	Any vocalisation from the subject that is not task-relevant or part of an appropriate vocal response.	Screaming, yelling, inappropriate laughing, or any other irrelevant and/or in appropriate vocalisations	Begin coding at the onset of vocalisation, stop coding once irrelevant vocalisation ends.
Repetitive motor movement (0.48 ± 0.11, 91%)	Motor movements that occur at least three times, plus any additional occurrences of those movements.	Flapping of arms, rocking, flicking fingers, tapping.	Code when movement begins, stop coding when the movement stops. *If a movement happens three times in a row in any instance during the video, other instances of the same movement still count as repetitive movements even if they happen only twice.
Repetitive object usage (0.37 ± 0.12, 95%)	Any seemingly non-communicative, repetitive physical manipulation of an object.	Repetitively spinning, tapping, rolling an object.	Begin coding when action begins, stop coding when repetitive behaviour ends.

Cohen’s kappa and percent agreement for each variable are given in parentheses.