Fig. 5. The effects of intrathecally administered midazolam (0.1 mg/kg; 15 min postinjection) on mechanical withdrawal thresholds. Thresholds were significantly reduced in the P21 group but in none of the other groups. There were no significant differences among any of the age groups. Bars indicate mean ± SE. *** P < 0.01, n = 6 per group.