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Human Reproduction, Vol. 16, No. 2, 277-281, February 2001
© 2001 European Society of Human Reproduction and Embryology

Monthly variation in human semen quality in male partners of infertile women in the tropics

Sin-Eng Chia1,,3, Soon-Tiong Alvin Lim2, Lee-Mee Ho2 and Sun-Kuie Tay2

1 Department of Community, Occupational & Family Medicine, National University of Singapore and 2 Department of Obstetrics & Gynaecology, Singapore General Hospital, Singapore

The aim of the study was to determine whether there were significant `seasonal' variations in the rhythm of sperm parameters (i.e. semen volume and sperm density) of men who reside in the tropics. A total of 7656 semen analysis results from the department of obstetrics and gynaecology of a tertiary general hospital was analysed. These samples were obtained as part of an initial screening for male partners of couples with problems trying to conceive who were attending a fertility clinic from 1991 to 1995. The subjects' mean semen volume and sperm density of 2.9 ml and 26.9x106/ml respectively were within the World Health Organization reference values. There were no significant month-to-month variations in the adjusted (for age of subject, year of test and technologist who performed the analysis by analysis of co-variance, ANCOVA) mean semen volume and sperm density over the 5 year period. Variations in semen volume and density observed in the temperate climates are not seen in this study, which was conducted in subjects staying in the tropics. This observation may be related to relative constant temperature and hours of light exposure among men who reside in the tropics. As this study is, so far, published data from only one country, Singapore, it may not truly reflect the actual situation for individuals who are residing in the tropics.

Key words: daylight/semen volume/sperm density/temperature

3 To whom correspondence should be addressed at: Department of Community, Occupational & Family Medicine (MD3), Faculty of Medicine, National University of Singapore, 16 Medical Drive, Singapore 117597, Republic of Singapore. E-mail: cofcse{at}nus.edu.sg


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