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. 2014 Jul 8;9(7):e101572. doi: 10.1371/journal.pone.0101572

Table 4. The effects of silica nanoparticles on DNA damage rate of epididymis sperm in male mice.

Group	Number of non-damage sperm	Number of damage sperm	Total number of sperm	Rate of damage sperm (%)	P vaule of Chi Square test
15days control	115	17	132	12.88	0.016
15days Nano-Sio₂	99	32	131	24.43^*
35days control	116	11	127	8.66	0.000
35days Nano-Sio₂	77	49	126	38.89^*
60days control	129	12	132	9.09	0.424
60days Nano-Sio₂	116	16	132	12.12

*Represents significant difference between control group and nanoparticles group at same time (P<0.05).