e/Rule of three (medicine)

Information
has gloss	eng: In the statistical analysis of clinical trials, the rule of three states that if no major adverse events occurred in a group of n people, there can be 95% confidence that the chance of major adverse events is less than one in n / 3 (or equivalently, less than 3 in n). This is an approximate result, but is a very good approximation when n > 30.
lexicalization	eng: rule of three
instance of	c/Clinical trials