Validation of a Japanese version of the Stanford Health Assessment Questionnaire in 3,763 patients with rheumatoid arthritis

Author(s): Matsuda Y, Singh G, Yamanaka H, Tanaka E, Urano W, et al.


Objective:To develop and validate a self-administered instrument for measuring functional status in Japanese-speaking rheumatoid arthritis patients.

Methods:We translated the Stanford Health Assessment Questionnaire (HAQ) into Japanese (original HAQ), and then made a tentative Japanese version of the HAQ (J-HAQ) with culturally appropriate modifications of the arising, eating, and reach category questions. The questionnaire was then administered to 3,763 RA patients (82.6% female; mean age 58.0 years; mean onset age 47.4 years; mean disease duration 10.5 years).

Results:This instrument showed excellent internal reliability (Cronbach's alpha = 0.927), with a mean interitem correlation of 0.60. For the arising category question, the J-HAQ asks about arising from a futon in addition to a bed because futons are still common in Japanese culture. Arising from a futon is generally more difficult for disabled individuals than is arising from a bed, so the arising score was higher in the J-HAQ (mean score 0.82) than in the original HAQ (0.48). The average scores for the eating and reach categories were virtually identical for the original HAQ and the J-HAQ, with correlation coefficients of 0.979 and 0.926, respectively. Thus, the overall disability index (average of the scores for all functional areas) was higher in the J-HAQ (0.81) than in the original HAQ (0.76), although the correlation coefficient was high (0.993). The test-retest reliability value (0.92), studied at a 1-week interval, revealed identical disability index scores measured on the 2 occasions.

Conclusion:The final version of the J-HAQ is a valid and reliable instrument for measuring functional status in Japanese-speaking RA patients.

Similar Articles

Cardiovascular death in rheumatoid arthritis: a population-based study

Author(s): Maradit-Kremers H, Nicola PJ, Crowson CS, Ballman KV, Gabriel SE

Mortality of rheumatoid arthritis in Japan: a longitudinal cohort study

Author(s): Hakoda M, Oiwa H, Kasagi F, Masunari N, Yamada M, et al.

Cause of death in 81 autopsied patients with rheumatoid arthritis

Author(s): Suzuki A, Ohosone Y, Obana M, Mita S, Matsuoka Y, et al.

Tight control in the treatment of rheumatoid arthritis: efficacy and feasibility

Author(s): Bakker MF, Jacobs JW, Verstappen SM, Bijlsma JW

Methotrexate and mortality in patients with rheumatoid arthritis: a prospective study

Author(s): Choi HK, Hernán MA, Seeger JD, Robins JM, Wolfe F

[Cause of death in autopsied RA patients]

Author(s): Toyoshima H, Kusaba T, Yamaguchi M

The American Rheumatism Association 1987 revised criteria for the classification of rheumatoid arthritis

Author(s): Arnett FC, Edworthy SM, Bloch DA, McShane DJ, Fries JF, et al.

Death certificate and mortality in rheumatoid arthritis

Author(s): Laakso M, Isomäki H, Mutru O, Koota K

Natural history and outcome in systemic AA amyloidosis

Author(s): Lachmann HJ, Goodman HJ, Gilbertson JA, Gallimore JR, Sabin CA, et al.

The mortality of rheumatoid arthritis

Author(s): Wolfe F, Mitchell DM, Sibley JT, Fries JF, Bloch DA, et al.