Table 2. Distribution of rats irradiated with the dosage of 25 Gy.

Post-irradiation	Grade	0	1	2	3	4	Total
45 days	Number	0	1	3	1	3	8
	Frequency (%)	0	12.5	37.5	12.5	37.5	100
	Cumulative total	0	1	4	5	8	-
	Cumulative frequency (%)	0	12.5	50	62.5	100	-
60 days	Number	0	1	1	1	5	8
	Frequency (%)	0	12.5	12.5	12.5	62.5	100
	Cumulative total	0	1	2	3	8	-
	Cumulative frequency (%)	0	12.5	25	37.5	100	-
90 days	Number	0	0	0	1	7	8
	Frequency (%)	0	0	0	12.5	87.5	100
	Cumulative total	0	0	0	1	8	-
	Cumulative frequency (%)	0	0	0	12.5	100	-