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Journal of Learning Disabilities
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An Epidemiological Study of Number Processing and Mental Calculation in Greek Schoolchildren

Anastasia Koumoula

First Department of the Child Psychiatric Hospital of Attica, Athens, Greece

Vanda Tsironi

First Department of the Child Psychiatric Hospital of Attica, Athens, Greece

Victoria Stamouli

First Department of the Child Psychiatric Hospital of Attica, Athens, Greece

Irini Bardani

First Department of the Child Psychiatric Hospital of Attica, Athens, Greece

Stavroula Siapati

First Department of the Child Psychiatric Hospital of Attica, Athens, Greece

Annik Graham

First Department of the Child Psychiatric Hospital of Attica, Athens, Greece

Ignatios Kafantaris

Irini Charalambidou

Child and Adolescent Psychiatric Department, St. Joseph Hospital, Berlin

Georges Dellatolas

Neuroscience Center Zurich, University/ETH Zurich

Michael von Aster

Department, St. Joseph Hospital, Berlin, University/ETH Zurich

The aim of this study was to validate and standardize an instrument for the diagnosis of developmental dyscalculia (mathematics disorder) in a Greek population and to obtain relevant epidemiological data. We used the Neuropsychological Test Battery for Number Processing and Calculation in Children (NUCALC) in a community sample of 240 students ages 7 to 11 years from urban and rural schools. There were no differences between genders in arithmetical performance; however, the effects of grade and socioeconomic level were significant. Prevalence was higher in the rural than in the urban area. A cross-cultural comparison of the Greek data with those obtained with the same instrument in other countries in schoolchildren of the same age was performed.

Journal of Learning Disabilities, Vol. 37, No. 5, 377-388 (2004)
DOI: 10.1177/00222194040370050201
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PNAS, September 15, 2009; 106(37): E102 - E102.
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