Table 3. Comparison of the results of sperm washing followed by swim-up and discontinuous density gradient centrifugation before and after semen processing.
		Sperm washing followed by swim-up (n=17) Mean ± Std Dev	Isolate (n=41) Mean ± Std Dev	P-value *
Concentration (x106/ml)	before	92.5 ± 56.9	81.1 ± 52.6	0.4642
	after	29.0 ± 28.2	64.8 ± 43.3	0.0027
Motility (%)	before	52.8 ± 12.9	58.0 ± 17.7	0.2748
	after	76.5 ± 18.5	76.0 ± 17.4	0.9285
Morphology (%) normal
	before	29.8 ± 7.0	29.6 ± 11.2	0.9450
	after	56.7 ± 12.8	45,3 ± 15.2	0.0095
abnormal	before	70.1 ± 7.0	70.3 ± 11.2	0.9450
	after	43.2 ± 12.8	54.0 ± 14.6	0.0106
Std Dev=standard deviation * Independent Student’s t-test with significant difference; P < 0.05