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Original Article

The SCAN-C in testing for auditory processing disorder in a sample of British children

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Pages 780-786 | Received 19 Dec 2006, Published online: 07 Jul 2009
 

Abstract

The SCAN-C is a test for auditory processing disorders in children developed in the USA. There are concerns that the SCAN-C may over-diagnose auditory processing disorders in UK children. There are also questions concerning the impact of language level and interpretation of SCAN-C results. SCAN-C results from 99 Oxfordshire school children aged 6 to 10 were compared to US-based normative data. Across all age bands, the UK sample scored significantly worse on two subtests: the filtered words (FW) and auditory figure-ground (AFG) sections as well as on the composite score. Differences in performance were largely due to accent effects. Applying US norms to UK children's performance results in a high rate of over-identification of listening difficulties. However, we show that US norms can be used provided SCAN-C scores for children in the UK are adjusted by adding a constant. Using factor analysis, SCAN-C subtests mapped onto two factors; FW and AFG onto a ‘monaural low-redundancy degradation’ factor, and CW and CS onto a ‘binaural separation/competition’ factor. Implications for use of the SCAN-C with UK children are discussed.

Abbreviations
FW=

Filtered words

AFG=

Auditory figure-ground

CW=

Competing words

CS=

Competing sentences

CCC-2=

Children's communication checklist 2

APD=

Auditory processing disorder

PPVT=

Peabody picture vocabulary test

CELF-R=

Clinical evaluation of language fundamentals-revised

Abbreviations
FW=

Filtered words

AFG=

Auditory figure-ground

CW=

Competing words

CS=

Competing sentences

CCC-2=

Children's communication checklist 2

APD=

Auditory processing disorder

PPVT=

Peabody picture vocabulary test

CELF-R=

Clinical evaluation of language fundamentals-revised

Sumario

El SCAN-C es una prueba desarrollada en EUA para evaluar el procesamiento auditivo en niños. Existe preocupación en el sentido de que el SCAN-C sobre-diagnostique problemas de procesamiento auditivo en los niños del Reino Unido (RU). También se ha cuestionado el impacto del nivel de lenguaje o la interpretación de los resultados del SCAN-C. Los resultados del SCAN-C en 99 niños escolares de Oxfordshire con edades de 6 a 10 años fueron comparados con datos normativos de los EEUU. En todos los rangos de edad, la muestra poblacional del RU obtuvo resultados significativamente peores en dos sub-pruebas: las palabras filtradas (FW) y la sección de figura-fondo auditiva (AFG), como también en los resultados compuestos. Las diferencias en el desempeño fueron por mucho debidos a las diferencias de acento. La aplicación de las normas americanas en niños británicos resulta en un alto índice de sobre-identificación de dificultades en el aprendizaje. Sin embargo, demostramos que las normas americanas del SCAN-C se pueden ajustar agregando una constante para calificar a los niños británicos. Se utiliza un factor de análisis las sub-pruebas de SCAN-C aplicadas con dos factores: FW y AFG con una “degradación monoaural de baja redundancia”, y CW y CS con un factor de “separación/competición binaural”. Las implicaciones para el uso del SCAN-C con niños británicos son discutidas.

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