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BACKGROUND Screening depressivity among adolescents is a key public health priority. In order to measure the severity of depressive symptomatology, a four-dimensional 20 items scale called "Center for Epidemiological Studies-Depression Scale" (CES-D) was developed. A shorter 10-item version was developed and validated (Andresen et al.). For this brief(More)
This study was a direct prolongation of a study by Wellman, Collins, and Glieberman (1981), which showed that, provided a sufficiently sensitive methodology is used, it is possible to demonstrate experimentally that even 5-year-old children are capable of integrating two types of information--effort and difficulty of task--in their judgment of performance(More)
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