• Elena Castarlenas, Elisabet Sánchez-Rodríguez, Rocío de la Vega, Roman Roset, and Jordi Miró.
• *Unit for the Study and Treatment of Pain-ALGOS, Research Center for Behavior Assessment (CRAMC), Carretera de Valls, Tarragona †Department of Psychology, Institut d'Investigació Sanitària Pere Virgili, Universitat Rovira i Virgili, Catalonia, Spain.
• Clin J Pain. 2015 Mar 1;31(3):229-34.

ObjectivesElectronic pain measures are becoming common tools in the assessment of pediatric pain intensity. The aims of this study were (1) to examine the agreement between the verbal and the electronic versions of the 11-point Numerical Rating Scale (NRS-11) (vNRS-11 and eNRS-11, respectively) when used to assess pain intensity in adolescents; and (2) to report participants' preferences for each of the 2 alternatives.Materials And MethodsA total of 191 school children enrolled in grades 7 to 11 (mean age, 14.61; range, 12 to 18) participated. They were asked to report the highest intensity of the most frequent pain that they had experienced during the last 3 months using both the vNRS-11 and the eNRS-11. Agreement analyses were carried out using: (1) the Bland-Altman method, with confidence intervals (CI) of both 95% and 80%, and a maximum limit of agreement of ±1; and (2) weighted intrarater κ-coefficients between the ratings for each participant on the vNRS-11 and eNRS-11.ResultsThe limits of agreement at 95% fell outside the limit established a priori (scores ranged from -1.42 to 1.69), except for participants in grade 11 (-0.80, 0.88). Meanwhile, the limits of agreement at 80% CI fell inside the maximum limit established a priori (scores ranged from -0.88 to 0.94), except for participants in grade 8 (Supplemental Digital Content 2, http://links.lww.com/CJP/A97) (-0.88, 1.16). The κ-coefficients ranged from 0.786 to 0.912, indicating "almost perfect" agreement. A total of 83% of participants preferred the eNRS-11.DiscussionPain intensity ratings on the vNRS-11 and eNRS-11 seem to be comparable, at least for the 80% CI.

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