抄録
The results showed that, in an analysis of courts divided into nine, the only areas that had a significant fall rate for balls blocked across all side attacks were the zone close to the antenna and next to the net, with the total fall rate of balls from all side attacks into the zone close to the antenna being 47%, and the fall rate of those into Z3 next to the next being 25%, for a total of 71% when combined. Comparing the circumstances of the attacks between those in system（42%) and out of system（51%), the latter had a significantly higher fall rate to the zone close to the antenna, and, comparing the fall rates of both zones between in system（66%) and out of system（76%), the latter was again significantly higher. Further, in an analysis of courts divided by 36, the three areas that had significantly high fall rates across all side attacks showed front row side attacks had a rate of 34%, and back row side attacks had a rate of 50%, with the latter being significantly higher.
