"The development of appropriate rating scale categories may seem straightforward; however, in the absence of high quality evidence, or consensus for the optimal methods, PRO developers take many different approaches."
The importance of rating scales in measuring patient-reported outcomes
J Khadka, VK Gothwal, C McAlinden, EL Lamoureux, K Pesudovs
Health and Quality of Life Outcomes, 2012, 10:80
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