Table 5.

Data Synthesis⁴⁸: Levels of Evidence of Overall Quality of the QBPDS Measurement Properties per Language^{^a}

↵^a +++ or −−−=strong evidence of positive/negative result, ++ or −−=moderate evidence of positive/negative result, + or −=limited evidence of positive/negative result, +/−=conflicting evidence, ?=result indeterminate or unknown due to poor methodological quality, ?*=result unknown due to lacking information about the minimal important change, na=no information available, QBPDS=Quebec Back Pain Disability Questionnaire, RMDQ=Roland-Morris Disability Questionnaire, ODI=Oswestry Low Back Pain Disability Index, VAS=visual analog scale, NRPS=Numeric Rating Pain Scale.