Figure 1: Mean visual analogue pain scores (VAS) at scheduled time points in interscalenic brachial plexus block (IBPB), local (LIA) and control groups (C). F12,456=3.895; P<0.05. Error bars show the standard error of the mean. *Indicates the means of the treated groups that were significantly lesser than the C group (Post-hoc Dunnett’s test: pooled MS=1.328; df=280,12; P<0.025).