Table 1

Birth characteristics of 1942 subjects with cerebral palsy

	Early impairment			Late impairment
	1668 subjects			274 subjects
Characteristic	No.	%*	No. dead	No.	%*	No. dead
*Percentages for those with data available.
Sex
Female	714	43	90	118	43	21
Male	954	57	143	156	57	38

Birth weight (g)
Missing	47		12	16		3
≤1500	242	15	26	3	1	1
1501–2500	407	25	43	25	10	5
>2500	972	60	151	230	89	50

Gestational age (weeks):
Missing	111		22	36		6
<32	253	16	23	2	2	1
32–36	340	22	33	22	9	3
≥37	964	62	155	214	89	49

Year of birth:
1966–69	248	15	39	75	27	16
1970–73	262	16	53	69	25	20
1974–77	204	12	26	35	13	7
1978–81	272	16	32	39	14	5
1982–85	333	20	38	34	12	5
1986–89	348	21	45	22	8	6