Fig. 2
From: Decline of semen quality over the last 30 years in Uruguay
Graphic representation of the relationship between the donor’s sperm normal morphology and time. The mean of sperm considered normal was calculated in periods of 30 months and shown with time. a Graphic representation of the variation of the percentage of morphologically normal spermatozoa between the period 1988–1999, n = 65. b Modifications of normal sperm morphology between 2000 and 2019, n = 252. One way ANOVA test, Tukey post-test *p < 0.05, **p < 0.01,***p < 0.001