TABLE 3.

Trends and Characteristics in Birth Prevalence (Prev) of Congenital Spastic CP Per 1000 1-y Survivors by Birth Weight, Gestational Age, and Race/ Ethnicity, Birth Years 1985 to 2002

Characteristic	1985 to 1988		1992 to 1996		1998 to 2002		Average Annual Prevalence, 1985 to 2002	NHB: NHW PR (95% CI)a	P, Cochran–Armitage Trend Test
	n	Prev	n	Prev	n	Prev
Birthweight overall
NHW	81	1.4	70	1.2	76	1.3	1.3	—	0.742
NHB	80	2.2	117	2.4	135	2.4	2.4	1.8 (1.5 to 2.1)	0.664
<1500 g
NHW	26	69.0	20	48.7	21	39.3	50.7	—	0.048b
NHB	31	48.5	57	57.6	68	53.2	53.7	1.06 (0.8 to 1.4)	0.776
1500 to 2499 g
NHW	18	6.9	16	6.0	16	5.2	6.0	—	0.422
NHB	17	5.2	21	4.7	19	3.7	4.4	0.7 (0.5 to 1.1)	0.280
≥2500 g
NHW	37	0.7	34	0.6	39	0.7	0.7	—	0.737
NHB	32	1.0	39	0.9	48	1.0	1.0	1.4 (1.1 to 1.9)	0.889
Gestational age overall
NHW	76	1.4	70	1.3	76	1.4	1.4	—	0.922
NHB	71	2.1	117	2.8	135	2.7	2.6	1.9 (1.6 to 2.3)	0.156
<32 wks
NHW	26	55.7	23	44.7	22	36.1	44.6	—	0.125
NHB	25	30.5	61	47.5	62	42.8	41.7	0.9 (0.7 to 1.2)	0.245
32 to 36 wks
NHW	13	3.1	11	2.5	18	3.4	3.1	—	0.762
NHB	9	1.9	18	3.0	19	2.9	2.7	0.9 (0.6 to 1.3)	0.346
≥37 wks
NHW	37	0.7	36	0.7	36	0.7	0.7	—	0.812
NHB	37	1.3	38	0.9	54	1.1	1.1	1.6 (1.2 to 2.0)	0.493

^aNHW children served as the referent group.

^bSignificant at P < .05.