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Author	Diagnostic Criteria	Rate/1,000 (95%CI)*	Nº Children with Autistic Disorder	Nº Children in Population	Male/Female Ratio	IQ#70 %
Lotter, 1996	Kanner	0.45 (0.31-0.62)	35	78,000	2.6	84
Brask, 1972	Kanner	0.43 (0.26-0.66)	20	46,500	1.5	-
Wing & Gould, 1979	Kanner	0.49 (0.29-0.78)	17	34,700	16.0	70
Hoshino et al, 1982	Kanner	0.23 (0.19-0.27)	142	609,848	9.9	-
Ishii & Takahashii, 1983	DSM III	1.60 (1.21-2.08)	56	35,000	6.0	-
Bohman et al, 1983	Rutter	0.56 (0.40-0.77)	39	69,000	1.6	80
Gillberg, 1984	DSM III	0.40  (0.30-0.52)	51	128,600	1.8	78
McCarthy et al, 1984	DSM III	0.43  (0.29-0.62)	28	65,000	1.3	-
Steinhausen et al, 1986	Rutter	0.19 (0.14-0.24)	52	279,616	2.3	-
Matsuishi et al, 1987	DSM III	1.55  (1.16-2.04)	51	32,834	4.0	nr
Burd et al, 1987	DSM III	0.33 (0.25-0.42)	59	180,986	2.7	nr
Bryson et al, 1988	DSM III-R	1.01  (0.62-1.54)	21	20,800	2.5	76
Tanoue et al, 1988	DSM III	1.38 (1.16-1.64)	132	95,394	4.1	nr
Ritvo et al, 1989	DSM III	0.25 (0.21-0.28)	241	769,620	3.7	66
Ciadella & Mammelle, 1989	Rutter	0.45 (0.34-0.56)	61	135,180	2.0	nr
Sugiyama & Abe, 1989	DSM III	1.30 (0.74-1.95)	16	12,263	nr	nr
Gillberg et al, 1991	DSM III-R	0.95 (0.74-1.19)	74	78,100	2.9	82
Fombonne & du Mazaubrun, 1992	DSM III	0.49 (0.41-0.57)	154	274,816	2.1	87
Webb et al, 1997	DSM III	0.72  (0.54-0.95)	53	73,301	6.6	-
Baron-Cohen et al, 1996	ICD-10	0.63 (0.30-1.15)	10	16,000	nr	-
Honda et al, 1996	ICD-10	2.11 (1.26-3.35)	18	8,537	2.6	50
Fombonne et al, 1997	ICD-10	0.54 (0.46-0.62)	174	325,347	1.8	88
Arvidsson et al, 1997	ICD-10	3.10 (1.16-6.84)	6	1,941	5.0	100
Sponheim & Skejeldal, 1998	ICD-10	0.38 (0.25-0.56)	25	65,688	1.9	64
Kadesjo, Gillberg & Hagberg, 1999	ICD-10	6.00  (1.90-14.10)	5	826	**	60
Baird et al, in press	ICD-10	3.08  (2.29-4.06)	50	16,235	15.7	40

*Confidence intervals computed by authors.

Extracted from "Prevalence of Autism in Brick Township, New Jersey, 1998", Community Report, Centers for Disease Control and Prevention, April 2000, http://www.cdc.gov/nceh/programs/cddh/dd/brick.htm