I read some studies in Software defect predictions (published in good journals) that mentioned that we should use datasets with an Events Per Variable (EPV) greater than 10; otherwise the results will be susceptible. 
My question is, what is the meaning of authors by the word "susceptible"? In other words, what are the disadvantages of using datasets having EPV less than 10? Do they mean, datasets with EPV > 10 provides more accurate prediction than the datasets with EPV < 10 ? 

Thanks