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Prevalence of autism and parentally reported triggers in a north east London population
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  • Published on:
    A missing confounder

    Dear Editor,

    Figure 1 in this study shows a rise in autism incidence (recorded) from 22 cases in the birth cohort of 1989 to 46 in 1991. R Lingam, A Simmons, N Andrews, E Miller, J Stowe and B Taylor fail to take into consideration the introduction of the accelerated Diptheria, Pertussis, Tetanus (DPT) as a potential confounder, advancing the doses from 3, 5 and 10 months to 2, 3 and 4 months [1]: each dose also c...

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    Conflict of Interest:
    None declared.
  • Published on:
    Prevalence of autism: no evidence for the conclusion

    Dear Editor

    In view of the widespread British media coverage of this study last week in advance of its publication it is interesting to discover how weak its claims actually are:

    "The prevalence of autism, which was apparently rising from 1979 to 1992, reached a plateau from 1992 to 1996 at a rate of some 2.6 per 1000 live births. This levelling off, together with the reducing age at diagnosis, sugg...

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    Conflict of Interest:
    None declared.