Table 2.

Bias Statistics for DBC-P24 in Syndrome Groups in Three Waves of ACAD Study

Syndrome group	Bias		Observations	Participants
	Mean	SD
Autism	.002	.094	309	119
Fragile X	.009	.084	176	64
Prader-Willi	.034	.101	116	51
Williams	-.039	.090	164	63

Note. DBC-P24 = Random selection based short form. ACAD = Australian Child to Adult Development.