Table 4.

Predictive Power of DISC-IV Hyperactive/Impulsive 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. Fidgets	.60	.92	.92	.61	.73	.35	17.63***	.73	.90	.92	.69	.80	.48	24.30***	.74	.85	.87	.71	.79	.49	15.67***
2. Leaves seat	.80	.76	.83	.72	.79	.53	13.00***	.78	.72	.81	.69	.76	.48	9.32***	.75	.85	.87	.72	.79	.51	17.09***
3. Runs/climbs/restless	.97	.67	.81	.94	.85	.91	73.00***	.95	.62	.79	.89	.81	.81	28.55***	.93	.66	.78	.89	.81	.80	27.61***
4. Difficulty engaging in leisure activities quietly	.52	.96	.95	.58	.70	.29	26.54***	.47	.98	.97	.56	.68	.26	43.97***	.51	.93	.91	.59	.69	.28	14.81***
5. Seems “on the go” or “driven by a motor”	.69	.82	.85	.65	.75	.41	10.55***	.77	.80	.85	.70	.78	.50	13.41***	.69	.87	.88	.68	.77	.44	14.74***
6. Talks excessively	.64	.55	.68	.51	.60	.18	2.16*	.69	.58	.71	.56	.65	.26	3.06**	.64	.67	.72	.58	.65	.27	3.66**
7. Blurts out answers	.27	.98	.95	.48	.56	.12	18.18***	.46	.84	.81	.51	.61	.18	4.46**	.62	.85	.84	.63	.72	.35	9.44***
8. Has difficulty awaiting turn	.77	.78	.84	.70	.78	.50	12.41***	.74	.86	.89	.69	.79	.49	17.78***	.80	.87	.89	.77	.83	.60	27.22***
9. Interrupts or intrudes on others	.95	.45	.72	.85	.75	.75	14.58***	.95	.44	.71	.85	.74	.74	13.75***	.97	.40	.67	.90	.72	.83	19.33***

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;

^**p< .01;

^***p< .001