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Moderate to large effects (0.48 -1.04) were found in responsiveness scores in the 3 questionnaires. No major differences in reproducibility and responsiveness between the answer modalities were found. Conclusion. Although large variability between the scores on the original answer scales and the NRS was observed, the BASDAI, BASFI, and DFI can be administered with an NRS, which does not show important differences compared with the original scales.

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