|
Table 3. Comparison of fertilization between the two groups
|
|
Variable
|
2000-2002 (n=764)
|
2010-2012 (n=1536)
|
p-value
|
|
Male age (y-old)
|
35.0 ± 8.6
|
35.3 ± 8.1
|
0.318
|
|
Days of abstinence
|
4.2 ± 3.1
|
4.2 ± 2.7
|
0.777
|
|
Sperm sample volume (ml)
|
3.4 ± 1.8
|
3.3 ± 1.6
|
0.473
|
|
Sperm concentration/ml (million)
|
61.7 ± 69.4
|
26.7 ± 27.3
|
<0.001
|
|
Total sperm concentration (million)
|
183.0 ± 197.0
|
82.8 ± 89.5
|
<0.001
|
|
Progressive sperm motility (%)
|
36.4 ± 18.3
|
36.5 ± 19.2
|
0.812
|
|
Normal morphology (%)
|
4.6
|
2.7
|
<0.001
|
|
Incidence of azoospermia (%)
|
38/764 (4.9)
|
131/1536 (8.5)
|
0.001
|
|
Incidence of severe oligozoospermia (%)
|
114/726 (15.7)
|
426/1405 (30.3)
|
<0.001
|
Note: values are mean ± SD, unless otherwise noticed. SD: standard deviation.