Table 2.

Prevalence per 1000 (95% CI) of cerebral palsy (CP) among 8-year-old children by site, Autism and Developmental Disabilities Monitoring Network, surveillance years 2006, 2008, and 2010^a

	Surveillance year			Test for trend P-value
	2006 (N = 423 CP cases) prevalence per 1000 (95% CI)	2008 (N = 403 CP cases) prevalence per 1000 (95% CI)	2010 (N = 375 CP cases) prevalence per 1000 (95% CI)
Overall	3.5 (3.2, 3.9)	3.2 (2.9, 3.5)	2.9 (2.6, 3.2)	0.036
Sex
Male	3.8 (3.3, 4.3)	3.8 (3.4, 4.3)	3.1 (2.7, 3.5)	0.083
Female	3.1 (2.7, 3.6)	2.6 (2.2, 3.0)	2.6 (2.2, 3.0)	0.236
Race and ethnicity
White non-Hispanic	3.4 (3.0, 3.9)	2.9 (2.5, 3.3)	2.2 (1.9, 2.6)	0.002
Black non-Hispanic	3.5 (3.0, 4.1)	3.8 (3.2, 4.5)	3.7 (3.2, 4.3)	0.536
Hispanic	2.3 (1.6, 3.4)	2.5 (1.8, 3.5)	2.1 (1.5, 2.9)	0.191
Surveillance site
Alabamab	3.0 (2.3, 3.8)	3.3 (2.6, 4.2)	2.4 (1.8, 3.2)	0.392
Georgiac	4.1 (3.5, 4.7)	4.0 (3.5, 4.6)	3.4 (2.9, 4.0)	0.094
Missourid	3.2 (2.6, 4.0)	2.5 (2.0, 3.2)	2.7 (2.1, 3.4)	0.311
Wisconsine	3.1 (2.5, 3.8)	2.7 (2.2, 3.3)	2.5 (2.0, 3.0)	0.481
Documented postneonatal cause
No	3.2 (2.9, 3.5)	3.0 (2.7, 3.3)	2.6 (2.3, 2.9)	0.046f
Yes	0.3 (0.2, 0.4)	0.2 (0.1, 0.3)	0.2 (0.1, 0.3)

CI, confidence interval.

^aThe prevalence results for surveillance years 2006 and 2008 have been reported previously based on a larger surveillance area.^11,12 The results here are restricted to a surveillance area composed of counties that were included in all three surveillance years.

^bThe Alabama site included nine counties in central Alabama.

^cThe Georgia site included five counties of metropolitan Atlanta.

^dThe Missouri site included five counties in metropolitan St. Louis.

^eThe Wisconsin site included 10 counties in southeastern Wisconsin.

^fP-value not calculated due to small expected cell sizes.