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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

From: Rate of first recorded diagnosis of autism and other pervasive developmental disorders in United Kingdom general practice, 1988 to 2001

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