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Official Journal of the Japan Wood Research Society

Table 3 Deterioration level criteria

From: Comparison of natural durability of wood by stake tests followed by survival analysis

Deterioration level Conditions of stake
0 Sound
1 Partially slight rot and/or termite attack
2 Wholly slight rot and/or termite attack
3 Partially severe rot and/or termite attack on the condition in 2
4 Wholly severe rot and/or termite attack
5 Collapse of shape caused by rot and/or termite attack