Table 1. Findings From Included Reviews^a

^a WOMAC=Western Ontario and McMaster Universities Osteoarthritis Index, QR=quality of review, QPS=quality of studies, VAS=visual analog scale, SMD=standardized mean difference, CI=confidence interval, NNT=number needed to treat, WMD=weighted mean difference, ASU=avocado/soybean unsaponifiables, OA=osteoarthritis, NSAID=nonsteroidal anti-inflammatory drug, N/A=not available.

^bDowns SH, Black N. The feasibility of creating a checklist for the assessment of the methodological quality both of randomised and non-randomised studies of healthcare interventions. J Epidemiol Community Health. 1998;52:377–384.