In the passage we are analyzing here, the author mentions a couple of percentages to make his point. This is an example of statistical evidence. This type of evidence relies on numbers, usually resulting from surveys and researches, to offer support to a claim. If I say, for instance, that 70% of people who eat eggs lose fat and gain mass more quickly than those who do not eat eggs, I will be using statistical evidence to prove my point that eating eggs is helpful for bodybuilders - that is just an example.
