Figure 3: Box plot of normalized hand opening distance (upper plot) and wrist flexion angle (degree, lower plot) under each of the conditions. Significant differences between two paired conditions, reported by a post-hoc t-test, were plotted (* p<0.1, ** p<0.05, *** p<0.01). The blue, red and green lines represent the significant effects of FES, WHO, and FES combined with WHO, respectively. For example, as shown in the upper plot, there is a significant difference in the opening distance between not-using FES and using FES on finger+thumb, both with WHO applied, as marked by the blue line between the first 2 bars from left (p<0.1); and a significant difference in the opening distance between using WHO and not-using WHO, both without FES, as marked by the red line between bars #1 and #4 (p<0.05). The green line marks the comparison between using FES and using WHO to achieve neural wrist position.