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A pain scale measures a patient's pain intensity or other features. Pain scales are based on self-report, observational (behavioral), or physiological data. Self-report is considered primary and should be obtained if possible (since pain is a quale by definition, and therefore assessment based on any set scale of expected outcomes from similar cases can fail to provide useful clinical data). Pain scales are available for neonates, infants, children, adolescents, adults, seniors, and persons whose communication is impaired. Pain assessments are often regarded as "the 5th Vital Sign." 
Disease-Specific Pain Scale: DSPI = (ΣX · Y) · 100 where X is the highest pain level on a 0–10 scale and Y is the percentage of this pain level in the group. The DSPI is different from the simple numeric 0–10 scale in that it is measured for a group of patients with a specific diagnosis whereas the numeric 0–10 pain scale is administered individually.
Pediatric Pain Questionnaire (PPQ) for measuring pain in children
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