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Investigating children with mild to moderate learning difficulties
  1. PAUL GRINGRAS
  1. Paediatric Disability
  2. Harper House Children’s Services
  3. Harper Lane
  4. Radlett, Herts WD7 7HU

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    Editor,—Dr Corrigan and colleagues ask important questions about the value of diagnostic screening for children with mild to moderate developmental delay.1 Unfortunately, their study has many of the methodological weaknesses highlighted in a recent review on this field.2

    The vital issue of clear case definitions is not adequately addressed mainly because no standardised cognitive or developmental assessment tools were employed. Furthermore to meaningfully evaluate the performance of the diagnostic tests examined in this study requires not only accurate prevalence data, but also a knowledge of the individual tests’ sensitivities and specificities.

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