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Table 2 Proportion of males sampled that had at least one sperm in different categories of abnormality, and the mean proportion of sperm per male in each category. All abnormalities are included in the first category; some males had sperm with abnormalities in more than one category

From: Extensive variation in sperm morphology in a frog with no sperm competition

Abnormality Percent of males Proportion of sperm per male
(n = 85) mean [95 % CL] n = 85 males
all abnormalities 100 0.567 [0.533, 0.601]
cytoplasmic drop 100 0.446 [0.410, 0.482]
no tail 94.1 0.113 [0.092, 0.134]
two tails 42.4 0.013 [0.007, 0.018]
no head 50.6 0.012 [0.009, 0.016]
two heads 2.4 0.0003 [−0.0001, 0.0007]
other 7.1 0.0009 [0.0002, 0.002]