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Table 4 Crude incidence rates (per 10 000 person-years) and age standardised incidence ratios (SIR) for the period 1988 to 2001 by geographical area of the United Kingdom (listed in order of SIR)

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

  Autism Other PDDs ALL
Region Number of cases Incidence rate SIR Number of cases Incidence rate SIR Number of cases Incidence rate SIR (95%CI)
WALES 40 0.64 83 1 0.02 7 41 0.65 66 (49,90)
NORTH WEST 121 0.60 78 32 0.16 72 153 0.76 77 (66,90)
NORTHERN & YORKSHIRE 86 0.74 98 11 0.10 43 97 0.84 85 (70,104)
N. IRELAND 29 0.71 97 7 0.17 79 36 0.88 93 (67,129)
EASTERN 132 0.76 97 35 0.20 90 167 0.96 95 (82,111)
SCOTLAND 32 0.62 84 15 0.29 135 47 0.91 96 (72,128)
LONDON 112 0.79 103 24 0.17 78 136 0.96 97 (82,115)
TRENT 94 0.79 100 24 0.20 90 118 0.99 98 (82,117)
SOUTH WEST 99 0.72 92 44 0.32 144 143 1.03 103 (87,121)
WEST MIDLANDS 146 0.85 113 36 0.21 97 182 1.06 109 (94,126)
SOUTH EAST 206 1.00 128 84 0.41 184 290 1.40 141 (126,158)