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Table 1 First diagnoses of PDD by year of diagnosis and gender

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

Year Number of cases Person years at risk Crude incidence rate (per 10000 person-years) Male:Female incidence rate ratio Age standardised incidence ratio (S.I.R)
  All M F All M F All M F   All M F
1988 1 1 0 94474 49353 45121 0.11 0.20 0 8 10 0
1989 6 6 0 260978 135542 125436 0.23 0.44 0 19 22 0
1990 21 20 1 643830 332819 311012 0.33 0.60 0.03 18.7 28 32 8
1991 45 36 9 1118577 576722 541855 0.40 0.62 0.17 3.8 35 34 42
1992 45 37 8 1311605 675188 636417 0.34 0.55 0.13 4.3 31 31 33
1993 69 51 18 1376111 707674 668437 0.50 0.72 0.27 2.7 47 42 72
1994 77 61 16 1432528 735395 697134 0.54 0.83 0.23 3.6 52 49 64
1995 108 97 11 1476627 756200 720427 0.73 1.28 0.15 8.4 74 79 45
1996 102 85 17 1381242 705526 675716 0.74 1.21 0.25 4.8 78 78 77
1997 133 115 18 1283151 653791 629359 1.04 1.76 0.29 6.2 114 119 89
1998 192 152 40 1228058 624723 603335 1.56 2.43 0.66 3.7 180 173 218
1999 231 193 38 1121383 568937 552446 2.06 3.39 0.69 4.9 242 244 231
2000 211 179 32 935906 474344 461562 2.26 3.77 0.69 5.4 277 284 244
2001 169 139 30 567058 287574 279483 2.98 4.83 1.07 4.5 365 361 388
All 1410 1172 238 14231526 7283787 6947739 0.99 1.61 0.34 4.8 100 100 100