Table 2.

Estimated Caseness of ADHD by Simplified ADHD Classification (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
ADHD classification
	n	Cumulative n	%	Cumulative %	n	Cumulative n	%	Cumulative %	Absolute Δ	Relative Δ
Yes	2,759	2,759	4.04	4.04	3,873	3,873	5.49	5.49	1.45	35.79	[1.22, 1.67]
Probable	1,379	4,138	2.02	6.06	1,651	5,524	2.34	7.82	0.32	15.81	[0.16,0.47]
Doubtful	1,053	5,191	1.54	7.60	1,100	6,624	1.56	9.38	0.02	1.05	[−0.11,0.14]
No	63,110	68,301	92.40	100.00	63,985	70,609	90.62	100.00	−1.78	−1.93	[−2.07,−1.49]

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