Table 2.

Descriptive Statistics for Experimental Variables

	ASD M (SD)	TDC M (SD)
Youth smile magnitude
Mother	0.68 (0.36)	0.94 (0.49)
Research assistant*	0.53 (0.49)	1.00 (0.61)
Adult smile magnitude
Mother	0.74 (0.26)	0.84 (0.42)
Research assistant**	0.86 (0.40)	1.29 (0.42)
Interpersonal smile coordination
Mother	0.53 (0.07)	0.56 (0.07)
Research assistant**	0.52 (0.08)	0.61 (0.08)
Change in smile coordination over time
Mother	0.26 (0.16)	0.32 (0.17)
Research assistant**	0.24 (0.15)	0.40 (0.17)

Note: Asterisks denote significant group differences;

^*p < 0.05;

^**p ≤ 0.01.