Table 4.

Summary appraisal of OMERACT Filter evidence for the 4 global and 2 multiitem measures of at-work limitations/productivity. Updated from Tang, et al. J Rheumatol 2014;41:165–763 based on updated literature review (December 2013) and results of our MID/PAS and international cognitive debriefing studies.

OMERACT
TruthDiscriminationFeasibility
Global MeasuresFace/Content ValidityConstruct ValidityReliabilityResponsivenessRCTScore Interpretability
WPAI (item 5)+++++++++++++
WPS (item 4)+++++++++++++
QQ+++++++++
WAI (item 1)++++++++(+)*+++
Multiitem measures
  WALS++++++++(+)#+++
  WLQ-25++++++++(+)#+++
  • Rating criteria (based on overall appraisal of all available evidence in arthritis or MSK conditions): ++: evidence of this measurement property from 2 or more studies, in the absence of conflicting evidence; +: evidence of this measurement property from at least 1 study, and overall body of evidence supporting > refuting;

  • *: RCT shows no difference where one is not expected; not exclusively MSK population; evidence of ability to discriminate between subgroups where one group is improved and the other not (MID/PAS study), which provides some evidence of their ability to discriminate change between groups. We will continue to monitor results of ongoing trials using this tool;

  • #: trials ongoing, or in the case of the WLQ, trials were negative, and difference in WLQ was negative. Both WALS and WLQ have evidence of their ability to discriminate between subgroups where 1 group is improved and the other not, which provides some evidence of their ability to discriminate change between groups. We will continue to monitor results of ongoing trials using these tools. WPAI: Work Productivity and Activity Impairment Questionnaire; WPS: Arthritis-specific Work Productivity Survey; QQ: Quantity and Quality Method; WAI: Work Ability Index; WALS: Workplace Activity Limitations Scale; WLQ-25 PDmod: Work Limitations Questionnaire with modified physical demands scale; MID/PAS: minimal (clinically) important difference/patient acceptable states; RCT: randomized controlled trial; MSK: musculoskeletal.