Table 3.

Kendall's Tau-b partial correlations that show the strength of the association between the frequency of interaction types and the total number of spontaneous interactions with the children's chronological age, ADOS-2 Module, ADOS-2 Calibrated Severity Score (CSS), CARS-2 score, and the VABS-2 communication (CD) and socialization domain (SD).

	Interaction type
Measure	Exploratory	Relational	Functional	Social overture	Interactions total
Age	−0.12	−0.05	−0.13	0.08	−0.11
Language ability
ADOS-2 module	−0.05	0.08	0.39**	0.63***	0.41**
VABS-2 CD	−0.16	0.11	0.32	0.31	0.21
Autism spectrum severity
ADOS-2 CSS	0.14	−0.01	−0.35**	−0.22	−0.19
CARS-2	0.06	−0.03	−0.18	−0.28*	−0.21
Social functioning
VABS-2 SD	−0.06	0.02	0.33*	0.35*	0.34*

The partial correlations were controlled for differences in session length.

^*Correlation is significant at the 0.05 level (2-tailed).

^**Correlation is significant at the 0.01 level (2-tailed).

^***Correlation is significant at the 0.001 level (2-tailed).