Frequency of birthweight categories among all cerebral palsy (CP) cases (including those with documented post-neonatal aetiology) at age 8 years, by surveillance year, by race and ethnicity, sex, co-occurring epilepsy, and co-occurring autism spectrum disorder (ASD).

All CP cases with available birth certificate data, including those with documented postneonatal aetiology, age 8 years	Surveillance year 2006 (birth year 1998)	Surveillance year 2008 (birth year 2000)	Surveillance year 2010 (birth year 2002)
Total number of CP cases	316	314	286
% LBW	51.6	47.1	47.2
% VLBW	33.5	30.9	26.6
Number of white non-Hispanic cases	175	156	120
% LBW	43.4	40.4	40.8
% VLBW	20.6	21.8	19.2
Number of black non-Hispanic cases	114	121	126
% LBW	62.3	54.5	54.0
% VLBW	50.9	40.5	34.9
Number of Hispanic CP cases	13	26	26
% LBW	76.9	42.3	42.3
% VLBW	61.5	26.9	19.2
Number of boys	173	194	158
% LBW (95% CI)	49.1	48.5	44.3
% VLBW (95% CI)	32.4	30.4	27.2
Number of girls	143	120	128
% LBW (95% CI)	54.5	45.0	50.8
% VLBW (95% CI)	35.0	30.4	27.2
Number with co-occurring epilepsy	111	127	125
% LBW (95% CI)	43.2	45.7	44.0
% VLBW (95% CI)	26.1	26.0	25.6
Number with no co-occurring epilepsy	205	187	161
% LBW (95% CI)	56.1	48.1	49.7
% VLBW (95% CI)	37.6	33.8	27.3
Number with co-occurring ASD	20	21	23
% LBW (95% CI)	70.0	42.9	56.5
% VLBW (95% CI)	30.0	28.6	34.8
Number with no co-occurring ASD	296	293	263
% LBW (95% CI)	50.3	47.4	46.4
% VLBW (95% CI)	33.8	31.1	25.9

CI, confidence interval; LBW, low birthweight (<2500 g); VLBW, very low birthweight (<1500 g).