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The questionnaire most frequently used worldwide to measure physical disability in rheumatic diseases is the Stanford Health Assessment Questionnaire (HAQ) Disability Index.1 In 2001, the Nijmegen group published a quite literal Dutch translation of the questionnaire2 to replace their version of 1990.3 Two other translations exist: from Leiden (1984)4 and Utrecht (Vragenlijst Dagelijks Functioneren, 1990).5 All translations have been validated to some extent and have seen extensive use, coexisting in parallel without any major problems.
Unfortunately, the 2001 Dutch HAQ did not replace the other versions. This is not unique to The Netherlands and may be inconsequential,6 but using …
Competing interests: None.
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