Hum. Reprod. Advance Access originally published online on October 5, 2006
Human Reproduction 2007 22(2):477-484; doi:10.1093/humrep/del383
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Semen quality in a residential, geographic and age representative sample of healthy Chinese men
1 Shanghai Institute of Planned Parenthood Research, Shanghai, P.R. China 2 OMNI Research Group, Department of Obstetrics & Gynecology 3 Clinical Epidemiology Program, Ottawa Health Research Institute 4 McLaughlin Centre for Population Health Risk Assessment, Institute of Population Health and 5 Department of Epidemiology and Community Medicine, University of Ottawa, Ottawa, Ontario, Canada
6 To whom correspondence should be addressed at: OMNI Research Group, Department of Obstetrics & Gynecology, University of Ottawa, 501 Smyth Road, Box 241, Ottawa, Ontario, Canada K1H 8L6. E-mail: swwen{at}ohri.ca
BACKGROUND: Population-based study of semen quality is rare in literature. METHODS: Healthy men aged 20–60 years from six Chinese provinces were invited to participate in the study between December 2000 and November 2002. Posters were distributed in the participating counties to enroll 200 subjects from each province. Medians, percentiles, and proportions below lower threshold of the WHO criteria for semen parameters were calculated. Generalized linear models were used to examine the determinants of semen quality. RESULTS: Semen samples from 1191 healthy Chinese men were collected and analysed. The medians (5th and 95th percentiles) were 2.3 ml (1.0–4.5) for semen volume, 65 x 106/ml (20–150) for semen concentration, 154 x 106/ejection (29–421) for sperm count, 19% (5–32) for rapid progressive motility, 46% (29–66) for progressive motility, 67% (47–81) for total motile spermatozoa, 70% (48–88) for sperm viability and 39% (23–76) for normal morphology. Many healthy Chinese men had semen parameter values below the lower threshold of the WHO criteria. Region, age, abstinence duration and season were important determinants of semen quality. CONCLUSIONS: Chinese men have lower values of semen parameters according to WHO standard, and a lower threshold for normal semen parameters for Chinese men should be considered.
Key words: semen parameters/semen quality/healthy men/risk factor/Chinese
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