A comparison of seven-point and visual analogue scales. Data from a randomized trial - PubMed Many controlled trials rely on subjective measures of symptoms or quality of life as primary outcomes. The relative merits of different response options for these instruments is an important issue. Therefore, we compared the responsiveness and validity of seven-point versus visual analogue scales (V …

Compelling evidence from a #RandomizedTrial (RCT) looking at #PatientImportantOutcomes (PROMS): 7-point scales and #VisualAnalogueScales (VAS) show similar validity and responsiveness (sensitivity to change) to detect intervention effects. Either choice is fine.

pubmed.ncbi.nlm.nih.gov/2157581/