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Linear regression lines of the mean per year of morphological abnormalities which change significantly over the study. For each parameter, the graph shows the linear regression line with 95% confidence interval over the study period. For the percentage of spermatozoa with bent tail, results are showed until the end of 2002: (a) amorphous head; (b) multiple head; (c) bent tail; (d) tailless head; (e) headless tail; (f) multiple tail; (g) thin head; (h) cytoplasmic droplet.
