Table 1.

Estimated Caseness of ADHD by ADHD Classification (National Survey of Children’s Health, 2007–2012).

		2007–2008 (n = 68,301)				2011–2012 (n = 70,609)				Change		Relative %
													95% CI absolute change
ADHD classification												Cumulative % change
	Description	N	Cumulative n	%	Cumulative %	n	Cumulative n	%	Cumulative %	% Change	% change
Definite	Moderate/severe (all)	2,759	2,759	4.04	4.04	3,873	3,873	5.49	5.49	1.45	1.45	35.8	[1.22, 1.67]
Probable	Mild and meds (all comorbidities)	1,379	4,138	2.02	6.06	1,651	5,524	2.34	7.82	0.32	1.76	15.8	[0.16,0.47]
Doubtful	Mild + externalizing	105	4,243	0.15	6.21	125	5,649	0.18	8.00	0.02	1.79	15.2	[−0.02, 0.07]
	comorbidities only, no meds
	Mild + both externalizing and	40	4,283	0.06	6.27	58	5,707	0.08	8.08	0.02	1.81	40.3	[−0.004, 0.05]
	internalizing comorbidities,
	no meds
	Mild + internalizing comorbidities	85	4,368	0.12	6.40	1 15	5,822	0.16	8.25	0.04	1.85	30.9	[−0.001, 0.08]
	only, no meds
	Mild + no comorbidities, no	823	5,191	1.20	7.60	802	6,624	1.14	9.38	−0.07	1.78	−5.7	[−0.18,0.04]
	meds
Not ADHD	ADHD ever but not current,	1,471	6,662	2.15	9.75	1,434	8,058	2.03	1 1.41	−0.12	1.66	−5.7	[−0.27, 0.03]
	no meds
	No ADHD ever	61,639	68,301	90.25	100.00	62,551	70,609	88.59	100.00	−1.66		−1.8	[−1.98,−1.33]

Note. Weighted frequencies are rounded to the nearest integer. CI = confidence interval.