Figure 2. A, Time course of sensory block to electrical stimulation at T12. Boxplot displays median and tenth, twenty-fifth, seventy-fifth, and ninetieth percentiles for values. Significant block occurred over time (P < 0.001) with no difference between solutions. B, Time course of sensory block to electrical stimulation at L3. Boxplot displays median and tenth, twenty-fifth, seventy-fifth, and ninetieth percentiles for values. Significant block occurred over time (P < 0.001) with no difference between solutions. C, Time course of sensory block to electrical stimulation at S1. Boxplot displays median and tenth, twenty-fifth, seventy-fifth, and ninetieth percentiles for values. TENS = transcutaneous electrical nerve stimulation.