Figure 4. Sedation scores after administration of (A) 50 [micro sign]g, (B) 100 [micro sign]g, and (C) 200 [micro sign]g intrathecal clonidine. Intrathecal clonidine produced sedation in all groups. Significant dose-dependent differences (Kruskal-Wallis test with Bonferroni correction allowing for multiple comparisons) between groups occurred between 15 min and 30 min (P < 0.05).