| http://www.w3.org/ns/prov#value | - Measurement scales of the instruments analyzed It was notable that just two of the instruments studied - the Cardiac Analgesic Assessment Scale (CAAS)7 and the Toddler-Preschooler Postoperative Pain Scale (TPPPS)8,9 - use interval scales, i.e. scales that offer a more precise measurement, since there is a unit of measurement which has a constant interval all along the scale.6 The CAAS is a scale s
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