Table 3.

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

	2007–2008 (n = 68,301)						2011–2012 (n = 70,609)						Change 2008–2012
															95% Cl absolute change			95% Cl absolute change				95% Cl absolute change
ADHD classification													Absolute Δ	Relative Δ		Absolute Δ	Relative Δ		Absolute	Relative
	n	%	n	%	n	%	n	%	n	%	n	%							Δ		Δ
	Boys
	5–6 years		7–12 years		13–17 years		5–6 years		7–12 years		13–17 years		5–6 years			7–12 years			13–17 years
Yes	107	2.30	1,061	7.23	942	5.85	219	4.14	1,436	8.90	1,100	7.30	1.84	80.09	[1.15,2.53]	1.67	23.1	[1.06,2.28]	1.46		24.92	[0.91,2.01]
Probable	22	0.47	473	3.22	523	3.25	49	0.93	477	2.96	634	4.21	0.45	95.98	[0.13,0.78]	−0.27	−8.3	[−0.65, 0.12]	0.96		29.68	[0.54, 1.39]
Doubtful	49	1.05	241	1.64	501	3.11	67	1.27	296	1.83	408	2.71	0.21	20.31	[−0.21,0.63]	0.19	1 1.7	[−0.10,0.48]	−0.40		−12.88	[−0.77, −0.03]
No	4,482	96.18	12,905	87.91	14,144	87.80	4,961	93.67	13,932	86.31	12,917	85.78	−2.51	−2.61	[−3.38,−1.67]	−1.59	−1.8	[−2.34, −0.85]	−2.02		−2.30	[−2.77,−1.27]
	Girls
	5–6 years		7–12 years		13–17 years		5–6 years		7–12 years		13–17 years		5–6 years			7–12 years			13–17 years
Yes	31	0.71	294	2.14	373	2.54	67	1.36	566	3.64	502	3.70	0.64	90.4	[0.24, 1.05]	1.50	70.1	[1.12, 1.88]	1.16		45.75	[0.76, 1.57]
Probable	16	0.37	136	0.99	263	1.79	1 1	0.22	231	1.49	282	2.08	−0.15	−39.4	[−0.37, 0.08]	0.50	50.1	[0.24, 0.75]	0.29		16.12	[−0.03,0.61]
Doubtful	12	0.28	135	0.98	164	1.12	18	0.36	123	0.79	208	1.53	0.09	32.2	[−0.14,0.32]	−0.19	−19.5	[−0.41,0.02]	0.42		37.35	[0.15, 0.68]
No	4,289	98.64	13,159	95.88	13,883	94.55	4,839	98.05	14,612	94.08	12,566	92.68	−0.59	−0.6	[−1.10,−0.07]	−1.81	−1.9	[−2.31,−1.31]	−1.87		−1.98	[−2.44,−1.30]
	All 5–6 years		7–12 years		13–17 years		5–6 years		7–12 years		13–17 years		5–6 years			7–12 years			13–17 years
Yes	140	1.55	1,344	4.72	1,303	4.23	285	2.78	2,015	6.35	1,587	5.54	1.23	79.1	[0.82, 1.63]	1.63	34.5	[1.26, 1.99]	1.31		31.11	[0.97, 1.66]
Probable	38	0.42	601	2.1 1	781	2.53	60	0.59	708	2.23	907	3.17	0.16	38.9	[−0.04, 0.36]	0.12	5.7	[−0.11,0.35]	0.63		25.01	[0.37, 0.90]
Doubtful	62	0.69	374	1.31	658	2.13	85	0.83	419	1.32	610	2.13	0.14	20.6	[−0.10,0.39]	0.01	0.5	[0.18,0.19]	0.00		−0.21	[−0.24, 0.23]
No	8,775	97.34	26,132	91.85	28,093	91.1 1	9,818	95.80	28,574	90.09	25,541	89.16	−1.53	−1.6	[−2.05,−1.02]	−1.76	−1.9	[−2.22.−1.30]	−1.94		−2.13	[−2.43,−1.47]

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