Variable

Item

Total (%)

Sperm concentration ×10⁶/ml

χ²

P-value

Odds ratio

95% CI

Sperm conc. ≥ 15 ×10⁶/ml.

Sperm conc. = 0 ×10⁶/ml 5 ml.

≥15

0

Semen volume <1.5

Semen volume ≥1.5

Semen volume <1.5

Semen volume ≥1.5

Freq.

%

Freq.

%

Freq.

%

Freq.

%

Freq.

%

Freq.

%

Age group

(yrs.)

<30

6 (1.1)

4

0.9

2

1.8

-

-

-

-

0

0.0

4

1.2

0

0.0

2

2.6

30 - 39.9

192 (34.2)

153

33.8

39

35.8

0.07*

0.80

0.51

0.09, 2.89

31

29.0

122

35.3

9

28.1

30

39.0

40 - 49.9

271 (48.2)

224

49.4

47

43.1

0.23*

0.64

0.42

0.07, 2.36

52

48.6

172

49.7

10

31.3

37

48.0

50 - 59.9

84 (14.9)

66

14.6

18

16.5

0.03*

0.87

0.55

0.09, 3.22

21

19.6

45

13.0

11

34.4

7

9.1

≥60

9 (1.6)

6

1.3

3

2.8

0.31*

0.58

1.00

0.11, 8.95

3

2.8

3

0.9

2

6.2

1

1.3

All

562 (100.0)

453

80.6

109

19.4

107

77.0

346

81.8

32

23.0

77

18.2

Mean (±sd)

42.6 (7.1)

42.6 (7.0)

42.6 (7.7)

44.5 (7.7)^!

42.00 (6.6)^!!

46.0 (7.9)^!

41.1 (7.1)^!!

Range

23 - 68

23 - 68

28 - 62

30 - 67

23 - 68

34 - 62

28 - 61

t-test (P-value)

0.12 (0.45)

3.04 (0.001)

3.01 (0.002)

t-test (P-value)

-

^!t = −0.95 (0.17)

^!!t = 1.02 (0.16)

BMI group

(Kg/m²)

18.5 - 24.9

171 (30.4)

148

32.7

23

21.1

-

-

-

-

39

36.4

109

31.5

9

39.5

14

18.2

25.0 - 29.9

294 (52.3)

234

51.6

60

64.2

3.60

0.05

1.65

0.98, 2.78

18

56.3

187

54.0

47

43.9

42

54.5

≥30

97 (17.3)

71

15.7

26

23.9

7.39

0.007

2.37

1.26, 4.42

5

15.6

50

14.5

21

19.6

21

27.3

All

562 (100.0)

453

80.6

109

19.4

62

11.03

346

88.07

77

13.70

77

13.70

Mean (±sd)

27.0 (4.1)

26.8 (4.0)

28.0 (4.2)

26.8 (4.1)

26.8 (4.0)

27.1 (3.3)

28.4 (4.5)

Range

18.5 - 70.0

18.5 - 70.0

19.4 - 48.7

19.9 - 38.0

18.5 - 70.0

20.2 - 34.8

19.4 - 48.7

t-test (P-value)

−2.70 (0.004)

−0.11 (0.46)

−2.19 (0.02)

Sperm concentration ×10⁶/ml

Normal

452 (49.83)

0.1 - 14.0

346 (38.15)

0

109 (12.02)