. 2018 Apr 17;15(4):780. doi: 10.3390/ijerph15040780

Table 6.

Division of $C_{i}^{1}$ values.

Grade	1	2	3	4	5
Range of $C_{i}^{1}$ values	(0 ≤ $C_{i}^{1}$ ≤ 0.2)	(0.2 ≤ $C_{i}^{1}$ ≤ 0.4)	(0.4 ≤ $C_{i}^{1}$ ≤ 0.6)	(0.6 ≤ $C_{i}^{1}$ ≤ 0.8)	(0.8 ≤ $C_{i}^{1}$ ≤ 1)