![]() ![]() ![]() To investigate whether semen quality has changed during the past 50 years. If so, some cases of subfertility may be preventable. It remains to be seen whether the increasing occurrence of obesity in the Western world may contribute to an epidemic of poor semen quality registered in some of the same countries. High or low BMI was associated with reduced semen quality. Semen volume and percentage of motile spermatozoa were not affected by BMI. Percentages of normal spermatozoa were reduced, although not significantly, among men with high or low BMI. After control for confounders, men with a BMI 25 kg/m(2) had a reduction in sperm concentration and total sperm count of 21.6% (95% CI 4.0%-39.4%) and 23.9% (95% CI 4.7%-43.2%), respectively, compared to men with BMI between 20-25 kg/m(2). ![]() Serum T, sex hormone-binding globulin (SHBG), and inhibin B all decreased with increasing BMI, whereas free androgen index and E(2) increased with increasing BMI. In addition, serum reproductive hormones were measured. Semen volume (in milliliters), sperm concentration (in million per milliliter), percentage of motile spermatozoa, percentage of spermatozoa with normal morphology, total sperm count (in million), and testis size (in milliliters). Danish young men were approached when they attended a compulsory physical examination to determine their fitness for military service. To examine the relationship between body mass index (BMI) and semen quality among young men from the general population. ![]()
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