Semen analysis in fertile patients undergoing vasectomy: reference values and variations according to age, length of sexual abstinence, seasonality, smoking habits and caffeine intake.

@article{Sobreiro2005SemenAI,
  title={Semen analysis in fertile patients undergoing vasectomy: reference values and variations according to age, length of sexual abstinence, seasonality, smoking habits and caffeine intake.},
  author={Bernardo Passos Sobreiro and Ant{\^o}nio Marmo Lucon and F{\'a}bio Firmbach Pasqualotto and Jorge Hallak and Kelly Silveira Athayde and Sami Arap},
  journal={Sao Paulo medical journal = Revista paulista de medicina},
  year={2005},
  volume={123 4},
  pages={161-6}
}
CONTEXT AND OBJECTIVE Recent studies have shown regional and population differences in semen characteristics. The objective was to establish reference values for semen analysis and to verify the effect that age, length of sexual abstinence, seasonality, smoking habits and coffee consumption have on fertile individuals' semen characteristics. DESIGN AND SETTING Prospective study in the Urology Division, Hospital das Clínicas, Universidade de São Paulo. METHODS Between September 1999 and… CONTINUE READING
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