Fig. 15. Funnel plots of this meta-analysis on sperm parameters. (A) Sperm number; World Health Organization (WHO) 1999 criteria. (B) Sperm concentration; WHO 1999 criteria. (C) Sperm motility; WHO 1999 criteria. (D) Morphologically normal spermatozoa; WHO 1999 criteria. (E) Sperm abnormalities; WHO 1999 criteria. (F) Progressive motile sperm; WHO 2010 criteria. (G) Sperm concentration; WHO 2010 criteria. (H) Sperm number; WHO 2010 criteria. SE: standard error, MD: mean difference, Qd: quaque die (every day), Bid: bis in die (twice a day).
