AKT-2009

A 50-year-old woman with chronic pain is undergoing evaluation. The effectiveness of pain management strategies is discussed with her, but she expresses doubt about the data. Upon closer examination, studies are presented that include a visual pain scale with paired data before and after non-pharmacological interventions are implemented. The data reveals a negative skew towards reduced pain levels with the use of non-pharmacological pain management techniques.

What statistical test would be appropriate to demonstrate the efficacy of this approach in managing pain?