Table 1.

Comparison of temporal changes in semen quality between the studied groups

Variable Year	1990-1992	2010-2012	P-value
No. of patients	707	1108
Age (Yr)	33.00	34.00	0.001
Volume (ml)	2.94 $\pm$ 1.09	2.83 $\pm$ 1.11	0.052
Concentration (Million/ml)	84.48 $\pm$ 1.6	95.55 $\pm$ 45.7	0.000
Grade A (%)	38.67 $\pm$ 16.18	30.59 $\pm$ 9.79	0.000
Grade B (%)	21.34 $\pm$ 10.2	30.30 $\pm$ 7.8	0.000
Grade C (%)	9.27 $\pm$ 5	9.01 $\pm$ 5.23	0.303
Grade D (%)	30.71 $\pm$ 12.2	30.18 $\pm$ 10.15	0.315
Normal morphology (%)	62.2 $\pm$ 12.3	44.44 $\pm$ 16.31	0.000
Data presented as Mean $\pm$ SD. Paired t test