Table 3

Crude rates of first diagnosis (per 10 000 person-years) and age standardised incidence ratios for autism and other PDDs by year of diagnosis

year

Total cases

Cases with 'other PDD' diagnosis

% cases with 'other PDD' diagnosis

incidence other PDDs

incidence autism

SIR other PDDs

SIR autism


1988

1

0

0

0

0.11

0

10

1989

6

0

0

0

0.23

0

23

1990

21

0

0

0

0.33

0

35

1991

45

0

0

0

0.40

0

44

1992

45

0

0

0

0.34

0

39

1993

69

2

3

0.01

0.49

6

58

1994

77

2

3

0.01

0.52

6

64

1995

108

3

3

0.02

0.71

9

91

1996

102

8

8

0.06

0.68

27

92

1997

133

18

14

0.14

0.90

67

128

1998

192

51

27

0.42

1.15

204

173

1999

231

87

38

0.78

1.28

369

200

2000

211

82

39

0.88

1.38

435

225

2001

169

60

36

1.06

1.92

495

319


Smeeth et al. BMC Medicine 2004 2:39   doi:10.1186/1741-7015-2-39

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