A comparison of pain rating scales by sampling from clinical trial data.

By Else Kristine Breivik, G. Björnsson, E. Skovlund. The Clinical Journal of Pain, 2000

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Validity of four pain intensity rating scales (2011, background): “These results are consistent with previous studies that support each scale’s validity [9,10,24,33,44,45], and show that small variations in water temperature result in significant differences in pain intensity ratings [22,40,53,54].”
Survey of chronic pain in Europe: Prevalence, impact on daily life, and treatment (2006, background): “Sixty-six percent were suffering moderate pain when they last experienced pain (i.e. reported a pain score of 5–7 on a 1–10-point NRS scale (Breivik et al., 2000)) and 34% were suffering severe pain (i.e., reported a pain score of 8–10 on a 1–10-point NRS scale (Breivik et al., 2000)) (Fig.”
Preoperative prediction of severe postoperative pain (2003, result): “In general there is good agreement between the VAS scale and the 11-point-numeric rating scale (Breivik et al., 2000), although patients and nurses expressed a preference for verbal ratings (Briggs and Closs, 1999).”