. Author manuscript; available in PMC: 2013 Sep 4.

Published in final edited form as: Res Autism Spectr Disord. 2011 January-March;5(1):164–174. doi: 10.1016/j.rasd.2010.03.006

Table 4.

Psychometric properties of self-report questionnaires, including alternative cutoffs.

Self-report	Threshold	Sensitivity	Specificity	PPV	NPV	Reliability
CDI-S (test sample)	61	0.27	0.89	0.50	0.74	0.80
CDI-S (test sample)	56	0.45	0.77	0.45	0.77	0.80
CDI-S (literature)^a	61	0.69	0.91			0.80
RCMAS (test sample)	61	0.33	0.88	0.78	0.50	0.88
RCMAS (test sample)	56	0.52	0.88	0.85	0.58	0.88
RCMAS (literature)	61	0.34	0.92			0.84
CASS-S (test sample)	65	0.23	0.79	0.63	0.39	0.86
CASS-S (test sample)	56	0.55	0.57	0.67	0.44	0.86
CASS-S (literature)^b	NA^c	0.81	0.84			0.75–0.90
SLOI-CV (test sample)	5	1.00	0.31	0.15	1.00	0.87
SLOI-CV (literature)	5	0.78	0.70			0.90

In this row: sensitivity and specificity of CDI, reliability coefficient of CDI-S.

In this row: sensitivity and specificity of CASS, reliability coefficient of CASS-S.

Unknown threshold.