Figure 5From: Single administration of intra-articular bupivacaine in arthroscopic knee surgery: a systematic review and meta-analysisDose–response effect of bupivacaine. Log of the relative risk of number of patients requiring supplementary analgesia in 19 trials of bupivacaine versus placebo by bupivacaine dose, together with a summary random-effects meta-regression. The area of each circle is inversely proportional to the variance of the log of the relative-risk estimate.Back to article page