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. Author manuscript; available in PMC: 2018 Oct 1.

Published in final edited form as: J Autism Dev Disord. 2017 Oct;47(10):3296–3310. doi: 10.1007/s10803-017-3231-0

Table 3.

Comparison of Positive Predictive Value, Sensitivity & Specificity Between Younger and Older Age Groups (Criterion: ASD Diagnosis)

			95% Confidence		Difference		Equivalence
	PPV	SE	Interval		Z	p	Z₁	p₁	Z₂	p₂

*M-CHAT PPV*

< 20 Months	0.31	0.07	0.18	0.44	−1.69	.090	2.70	.003	−6.8	.752

20+ Months	0.48	0.07	0.34	0.62

*M-CHAT/F PPV*

< 20 Months	0.36	0.07	0.22	0.49	−3.32	<.001	4.31	<.001	−2.33	.990

20+ Months	0.69	0.07	0.56	0.82

*M-CHAT/F Sensitivity*

< 20 Months	0.33	0.07	0.20	0.47	−4.14	<.001	5.14	<.001	−3.15	.999

20+ Months	0.75	0.06	0.63	0.87

*M-CHAT/F Specificity*

< 20 Months	0.73	0.06	0.60	0.85	0.38	.703	0.71	.239	1.47	.071

20+ Months	0.69	0.07	0.56	0.82

*M-CHAT/F False Discovery Rate*

< 20 Months	0.64	0.07	0.51	0.78	3.32	<.001	−2.33	.990	4.31	<.001

20+ Months	0.31	0.07	0.18	0.44

Difference
Equivalence	<20 Months n=48
Indeterminate	20+ Months n=50