Table 2.

Percentages of clinical responders per group and results of chi-square analyses

	PRT total				TAU		Chi-square analyses results
	% Endpoint		% Follow-up		% Endpoint	% Follow-up	Endpoint		Follow-up
	PRT	PRT + robot	PRT	PRT  + robot			X2(df)	p	X2(df)	p
Outcome
Comparison
SRS parents
2-group	20.8		30.6		18.2	20.0	0.06 (1)	0.797	0.80 (1)	0.371
3-group	13.0	28.0	12.0	50.0			10.72 (2)	0.419	90.66 (2)	0.008**
SRS teachers
2-group	27.3		25.6		18.2	21.7	0.66 (1)	0.417	0.12 (1)	0.729
3-group	13.0	42.9	16.7	36.8			50.75 (2)	0.050	20.47 (2)	0.291
CGI-I
2-group	55.1		59.2		36.4	45.5	2.13 (1)	0.144	10.16 (1)	0.282
3-group	44.0	66.7	48.0	70.8			40.65 (2)	0.098	30.74 (2)	0.155
ADOS-2
2-group	38.6				22.2		1.54 (1)	0.215
3-group	13.6	63.6					130.81 (2)	0.009**
OBVL
2-group	64.6		63.3		66.7	57.9	0.23 (1)	0.867	0.17 (1)	0.683
3-group	73.9	56.0	64.0	62.5			10.72 (2)	0.423	0.18 (2)	0.914

ADOS Autism Diagnostic Observation Schedule second edition, CGI-I Clinical Global Impression- Improvement scale, df degrees of freedom, OBVL Dutch Opvoedingsbelasting vragenlijst, p p value (two-tailed); PRT = group of participants who received Pivotal Response Treatment, PRT + robot group of participants who received robot-assisted Pivotal Response Treatment, PRT total total group of participants that received PRT, SRS Social Responsiveness Scale, TAU group of participants who received treatment-as-usual, X² test statistic resulting from Chi squared analyses, 2-group comparison between PRT total and TAU, 3-group comparison between PRT, PRT + robot and TAU

*p < .05, **p < .01