A biopsychosocial questionnaire for patients with primer Sjögren's syndrome: The BETY-Biopsychosocial Questionnaire.

Objective: The BETY-Biopsychosocial Questionnaire (BETY-BQ) is a scale developed to assess the biopsychosocial domains of patients with rheumatic diseases under a single roof. The study aimed to determine the validity and reliability of the BETY-BQ in patients with primary Sjögren's Syndrome (pSS).

Methods: At enrollment and one week, 91 patients with pSS completed the BETY-BQ. Construct validity was measured by correlating the BETY-BQ total score responses with the Health Assessment Questionnaire (HAQ), Hospital Anxiety and Depression Scale (HADS), 36-Item Short-Form Health Survey (SF-36), EULAR Sjögren's Syndrome Patient Reported Index (ESSPRI), EULAR Sjögren's Syndrome Disease Activity Index (ESSDAI), Primary Sjögren's Syndrome Quality of Life questionnaire (PSS-QoL), and Euro-QoL 5D (EQ-5D).

Results: The BETY-BQ correlated high to moderate with HAQ, bodily pain subscale of SF-36, Euro Qol-5D, PSS-QoL, HADS, and ESSPRI (0.776 to 0.557, p <0.05). Spearman's correlation coefficients between BETY-BQ total scores at baseline and average one week were very high (rho = 0.98, <0.001) and indicated substantial agreement between test-retest scores (ICC = 0.99, <0.001). Internal consistency reliability at baseline was 0.91 for the BETY-BQ.

Conclusions: BETY-BQ is valid and reliable for assessing biopsychosocial status in patients with pSS and can be used to measure outcomes in pSS.