Male characteristics

Age mean (± SD)

34.8 (7)

Race N (%)

Caucasian

171 (98%)

Smoking N (%)

Yes

61 (35%)

No

84 (48%)

Unknown

30 (17%)

Alcohol N (%)

Yes

99 (57%)

No

44 (25%)

Unknown

32 (18%)

Drugs N (%)

Yes

5 (3%)

No

132 (75%)

Unknown

38 (22%)

Professions with negative effects on fertility1 N (%)

10 (6%)

CO2-welder

5 (3%)

With solvents

4 (2%)

With oil

1 (1%)

No

119 (68%)

Unknown

46 (26%)

Medication possible affecting fertility2 N (%)

8 (5%)

Sexual dysfunction

8 (5%)

Decreased quality/quanitity of the sperm

6 (3%)

No

165 (94%)

(Former) disorders affecting fertility N (%)

6 (3%)

Malignancy

2 (1%)

Chemotherapy

2 (1%)

Retractlie testicle

1 (1%)

Testosterone deprivation

1 (1%)

Suppletion

2 (1%)

Spermatocele

1 (1%)

No

168 (96%)