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Table 4 Level of evidence per measurement property per instrument

From: Quality appraisal of generic self-reported instruments measuring health-related productivity changes: a systematic review

Instrument and paper Internal consistency Reliability Measurement error Content validity Structural validity Hypotheses testing Cross-cultural validity Criterion validity Responsiveness
WLQ[19, 21, 26–28, 36, 37, 42] +/- - N.A. ++ +++ -- N.A. +/- --
EWPS[19, 29] ? ? N.A. N.A. N.A. +/- N.A. ? ?
WPAI[19, 22, 39] ? ? ? N.A. N.A. -- N.A. -- ?
WPSI[19, 21, 31] ? ? N.A. ? N.A. ? N.A. +/- ?
AMA-guides[30] N.A. ? N.A. N.A. N.A. ? N.A. ? N.A.
WHO-HPQ[32, 33] N.A. - N.A. +++ + +/- N.A. +/- ?
SPS[34, 41] +++ - N.A. - +++ ++ N.A. ++ N.A.
PRODISQ[24] N.A. N.A. N.A. +++ N.A. N.A. N.A. N.A. N.A.
HRPQ-D[35] N.A. - N.A. ? N.A. ? N.A. - -
HLQ[20, 25] N.A. - N.A. N.A. N.A. N.A. N.A. -- N.A.
Q&Q[20] N.A. - N.A. N.A. N.A. N.A. N.A. - N.A.
WBA-P[38] N.A. N.A. N.A. N.A. + N.A. N.A. + N.A.
HWQ[40] + N.A. N.A. N.A. - N.A. N.A. - ?
WHI[43] N.A. - N.A. N.A. N.A. N.A. N.A. - -
VOLP[23] N.A. + N.A. N.A. N.A. N.A. N.A. - N.A.
  1. WLQ = Work Limitations Questionnaire; EWPS = Endicott Work Productivity Scale; WPSI = Work Productivity Short Inventory; WPAI = Work Productivity and Activity Impairment Instrument; AMA-guide = American Medical Association-Guides; WHO HPQ = World Health Organization Health and work Performance Questionnaire; SPS = Stanford Presenteeism Scale; PRODISQ = PROductivity and Disease Questionnaire; HRPQ-D = Health-Related Productivity Questionnaire Diary; HLQ = Health and Labor Questionnaire; Q&Q = Quality and Quantity questionnaire; WBA-P = Well-Being Assessment for Productivity; HWQ = Health and Work Questionnaire; WHI = Work and Health Interview; VOLP = Valuation of Lost Productivity questionnaire N.A. = Not Available; +++ = Strong positive level of evidence; ++ = Moderate positive level of evidence; + = Limited positive level of evidence; - = Limited negative level of evidence; -- = Moderate negative level of evidence; +/- = Conflicting level of evidence; ? = Unknown level of evidence due to poor methodological quality.