Table 1. General characteristics of analyzed semen samples (n=2300)
Fertilization	2000-2002 (n=315)	2010-2012 (n=842)	p-value
Total fertilization rate (%)	82.5	81.3	0.619
Abnormal fertilization rate (1PN + 3PN) (%)	12.2	7.8	<0.001

Note: Values are percentages. PN: pronucleus.