Table 10. Appropriate area based on the root diameter measurement

Division Total No.1 area (4∼6㎝) No.2 area (2∼4㎝) No.3 area (0㎝) No.4 area (-2∼-4㎝) No.5 area (-4∼-6㎝) Etc
Frequency (persons) 191 27 51 49 49 14 1
Ratio (%) 100 14.1 26.7 25.7 25.7 7.3 0.5