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All three scales correlated reasonably well with each other but have individual limitations in their potential to assess whether ED is present. In the absence of developing an improved research tool to assess ED, a PAED score >12 appears to provide greater sensitivity and specificity than a PAED score > or =10. However, the Watcha scale is a simpler tool to use in clinical practice and may have a higher overall sensitivity and specificity than the other scales.
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BAJWA et al. (2010) studied this question.
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