Fig. 1. Sensory function 4 days after intrathecal administration of 2.5% prilocaine (n = 30), 2.5% lidocaine (n = 28), or saline (n = 30). Tail-flick latency values were calculated as the average of latencies for the proximal, mid, and distal portions of the tail and are expressed as percent maximum possible effect (%MPE), where %MPE = ([tail-flick latency − baseline]/[cutoff − baseline]) × 100. Data represent mean ± SEM. *P < 0.05 versus  the other groups.