Men who smoke often have fewer sperm, slower-moving sperm, and a higher percentage of abnormally shaped sperm
Given the high proportion of zero values (~88.5%) and evidence of overdispersion (dispersion = 6.2), Poisson, negative binomial, and zero-inflated Poisson models were formally compared using likelihood-based criteria, while quasi-Poisson models were used exclusively to assess overdispersion and the robustness of standard errors
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-John McElheny Note: While all of our other pipes are photographed individually, these are not, and you may expect some reasonable cosmetic variation between the example we've photographed and the pipe you've received