Table 2

Proportions of cerebral palsy (CP) subtypes

Reference	Study	Duration	Number of cases of CP	Number of spastic cases of CP	Spastic cases as % of all cases	Unilateral spastic as % of spastic cases	Diplegia as % of spastic cases	Bilateral spastic as % of spastic cases	Diplegia as % of bilateral spastic cases
*Derived from rates in fig 4 of reference26.
†Includes 11 acquired cases 1979–82.
‡CP type only available in two thirds of cases.
§Includes 68 acquired cases.
26	North Italy*	1980–89				35	45	65	69
27, 28	Denmark	1979–90	908	734	81	23	62	77	81
29	North England	1991–96	537	499	93	37	23	63	36
23	Northeast England	1980–96	380	355	93	42	23	58	40
30	Avon, England	1979–88	237	196	83	39	39	61	63
31	Mersey, England	1984–89	497	460	93	39	23	61	38
32	Atlanta, USA	1985–87	204	166	81	34	19	66	28
33, 34, 35	Sweden†	1979–90	545	470	86	40	51	60	84
36	England and Scotland	1984–89	1649	1334	81	35	22	65	33
37	Slovenia	1981–90	768	651	85	33	43	67	64
38	Western Australia	1980–94	819	639	78	45	37	55	68
39	Rome, Italy	1977–96	282	213	76	33	27	67	40
40	Northern Ireland‡	1977–92	960	572	87	43	21	57	36
41	Norway	1980–89	46	39	85	49	33	51	65
42	Oxford, England §	1984–95	967	806	83	40		60
	Averaged percentage				85	38	33	62	53
	Range				76–93	23–49	19–62	51–77	28–84