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Correlation between DNA damage and World Health Organization recommended semen characteristics. Percentage DNA in the tail (normalized to control patient #1) was plotted as a function of sperm concentration (A) and percentage of progressively motile spermatozoa (B). Percentage progressively motile sperm was calculated as the sum of rapid and slow progressive motility. n = 123 patients. Spearman's rank test correlation coefficient and P value are indicated in italic.
