Table 3.

Predictive Powerof DISC-IV Inattentive Symptoms to Discriminate Children With and Without ADHD at T4

	T1							T2							T3
Symptoms	Sens	Spec	PPP	NPP	OPP	RIOC	OR	Sens	Spec	PPP	NPP	OPP	RIOC	OR	Sens	Spec	PPP	NPP	OPP	RIOC	OR
1. Fails to pay close attention to details/careless mistakes	.29	.98	.96	.49	.57	.14	20.75***	.39	.98	.97	.52	.63	.20	31.58***	.46	1.00	1.00	.58	.69	.27	--
2. Difficulty sustaining attention	.47	.98	.97	.56	.67	.25	43.75***	.58	.90	.90	.59	.71	.32	12.48***	.62	.98	.97	.66	.78	.41	74.35***
3. Doesn’t listen	.72	.80	.84	.66	.75	.43	10.54***	.77	.74	.81	.69	.76	.47	9.54***	.74	.72	.78	.68	.73	.43	7.36***
4. Doesn’t follow through	.85	.69	.80	.76	.79	.60	12.73***	.86	.72	.82	.78	.81	.64	16.46***	.80	.72	.79	.74	.77	.54	10.68***
5. Difficulty organizing tasks	.37	.88	.82	.49	.58	.14	4.47**	.53	.94	.93	.57	.69	.28	17.46***	.62	.83	.83	.63	.71	.34	8.05***
6. Avoids, dislikes activities requiring sustained effort	.59	.92	.92	.60	.72	.33	16.68***	.65	.88	.89	.63	.74	.38	13.54***	.61	.98	.97	.65	.77	.39	69.38***
7. Loses things	.40	.90	.86	.51	.60	.17	6.13**	.53	.82	.81	.54	.65	.23	5.08***	.59	.89	.88	.63	.72	.34	12.10***
8. Easily distracted	.80	.84	.88	.74	.82	.57	21.50***	.72	.82	.85	.66	.76	.43	11.50***	.75	.85	.87	.72	.79	.51	17.09***
9. Forgetful	.29	.94	.88	.48	.56	.12	6.64**	.42	.86	.82	.50	.60	.16	4.43**	.51	.96	.94	.60	.70	.29	23.25***

Note. T1 = Time 1; T2 = Time 2; T3 = Time 3; T4 = Time 4; Sens = Sensitivity; Spec = Specificity; PPP = Positive Predictive Power; NPP = Negative Predictive Power; OPP = Overall Predictive Power; RIOC = Relative Improvement Over Chance; OR = odds ratio. Significance of OR was calculated using Fischer’s Exact Test.

^**p< .01;

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