1. Relationship between semen quality and tobacco chewing in men undergoing infertility evaluation 
Tamer M. Said, M.D., Geetha Ranga, M.D., Ashok Agarwal, Ph.D., H.C.L.D. 
Fertility and Sterility 
Volume 84, Issue 3, Pages (September 2005)
DOI: /j.fertnstert
Copyright © 2005 American Society for Reproductive Medicine Terms and Conditions

2. FIGURE 1
Comparison of sperm parameters in semen samples collected from mild, moderate, and severe tobacco chewing groups. Values are expressed as mean ± standard deviation. Using unpaired t test, P<.0001 was considered significant compared to *mild group and to †moderate group.
Fertility and Sterility  , DOI: ( /j.fertnstert )
Copyright © 2005 American Society for Reproductive Medicine Terms and Conditions