Table 3

Appraisal of clarity between legacy (original) and rewritten HAQ-DI1 and PF-102 and "performance" and "capability" items

Item group (number completing)

% Unclear (SEc)


HAQ-DI, Legacy (20)

5.8 (0.56)

HAQ-DI, Rewritten (20)

5.4 (0.68)

PF-10, Legacy (10)

12.5 (1.6)

PF-10, Rewritten initial (10)

10.8 (1.1)

PF-10, Rewritten final (2)

4.5 (1.8)

Capability ("Are you able...?") (219)

8.9 (0.43)

Performance ("Did you...?") (48)

15.5 (1.2)


aHealth Assessment Questionnaire Disability Index.

b10-item physical function scale of the SF-36.

cStandard error of proportion.

Bruce et al. Arthritis Research & Therapy 2009 11:R191   doi:10.1186/ar2890

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