. Author manuscript; available in PMC: 2015 Jul 7.

Published in final edited form as: J Speech Lang Hear Res. 2010 Aug 18;54(1):99–117. doi: 10.1044/1092-4388(2010/10-0010)

Table 3.

Diagnostic accuracy associated with psycholinguistic markers of SLI.

Measure	Discrimination	Area under the curve	SE	Optimal cutoff^a	Sensitivity	Specificity	Positive likelihood ratio^b	Negative likelihood ratio^c
TEGI
	SLI vs. TD	0.954^***	0.025	95.75	0.84	0.95	16.80	0.168
	SLI vs. ADHD	0.900^***	0.047	93.70	0.79	0.85	5.27	0.247
NWR
	SLI vs. TD	0.924^***	0.046	85.91	0.95	0.90	9.50	0.056
	SLI vs. ADHD	0.875^***	0.054	84.90	0.90	0.70	3.00	0.143
SR
	SLI vs. TD	0.959^***	0.031	14.50	0.90	0.90	9.00	0.111
	SLI vs. ADHD	0.963^***	0.032	15.50	0.90	0.95	18.00	0.105
TNL
	SLI vs. TD	0.936^***	0.036	95.50	0.95	0.80	4.75	0.063
	SLI vs. ADHD	0.882^***	0.053	95.50	0.95	0.65	2.71	0.077

Note. SE = standard error.

Optimal cutoff was based on the TEGI Screening Test score (max = 100), the NWR Percent Phonemes Correct (max = 100), the SR Screening score (max = 32), and the TNL Narrative Language Ability Index (M = 100, SD = 15), and was determined using the Youden Index (J), where J = maximum (Sensitivity + Specificity − 1).

Positive likelihood ratio = Sensitivity/(1 − Specificity): Values of 1 = neutral, 3 = moderately positive, ≥ 10 = very positive.

Negative likelihood ratio = (1 − Sensitivity)/Specificity: Values of 1 = neutral, ≤ 0.30 = moderately negative, ≤ 0.10 = extremely negative.

^***

p < .001.