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INTRODUCTIONAccumulating evidence has demonstrated a global declining trend of human semen quality, which has raised increasing concern on male infertility.1,2 It was estimated that sperm concentration and total sperm number declined by 51.6% and 62.3%, respectively, in South/Central America, Asia, and Africa during 1973−20181; however, the underlying reasons remain less clear.3 Previous studies suggest that overall obesity defined by body mass index (BMI) is attributable to a higher risk of abnormal semen quality parameters, including sperm count, motility, and morphology.4–11 However, because obesity is defined by the presence of excess fat,12 simply using height and weight (e.g., BMI) to define obesity may lead to misclassification of obese population and fail to properly describe the body‐fat distribution, especially the abdominal fat. For example, individuals with a normal BMI can be centrally obese.13Compared with BMI describing overall obesity, central obesity measured by waist circumference (WC), waist‐to‐hip ratio (WHR), and waist‐to‐height ratio (WHtR) can provide a better assessment of body‐fat distribution.14 Although computed tomography or dual‐energy X‐ray absorptiometry (DEXA) scans can be used to directly measure body fat and aid in determining central obesity, the measurements of WC, WHR, and WHtR are simpler, more cost‐effective, and safer and have been widely used
Andrology – Wiley
Published: Jun 6, 2023
Keywords: central obesity; semen quality; sperm donation volunteers; waist circumference; waist‐to‐height ratio; waist‐to‐hip ratio
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