Background The BASDAI is a validated and widely used instrument to assess disease activity in SpA. Despite being a self-administered questionnaire, in daily practice, physicians often ask the questions themselves to the patients. To the authors best knowledge no data has been reported evaluating the agreement between patient and physician for the BASDAI.
Objectives To assess the agreement between patients and physicians reported BASDAI in axial SpA patients in daily practice.
Methods Patients with axial SpA according to the treating rheumatologist were included. First, patients were asked to fill out the BASDAI questionnaire in the waiting room. Thereafter, and being unaware of the results reported by the patients, the rheumatologist collected another BASDAI by reading out loud the questions to the patient and giving explanations if needed. Agreement for the total score and for each question was calculated by the intraclass correlation coefficient and its 95%CI. Evaluation of the agreement for the axial BASDAI (i.e. removing questions 3 and 4) was performed identically.
Results Fifty patients were included, aged 44 (±10) y and 32 (64%) males. Mean disease duration was 15 (±10) y and among them 34 (69,4%) had a radiographic sacroiliitis.
Agreement between patient and physician was excellent both for the BASDAI and axial BASDAI: ICC 0.91 [95% CI, 0.84–0.95] and ICC 0.94 [95% CI, 0.90–0.97], respectively. The lowest agreement was found for question 4 (i.e. referring to enthesitis) with an ICC [95%CI] =0.51 [0.28 – 0.69].
Conclusions An excellent agreement was found between patients and physicians for the BASDAI and its axial version. However, the question for enthesitis yielded only a moderate agreement, even in a group of patients with long-standing disease, and therefore used to fill this questionnaire. This should encourage physicians to use BASDAI as a self-administered questionnaire.
Acknowledgement This research was conducted while the first author Liana Ghukasyan was an ARTICULUM Fellow.
Disclosure of Interest None declared