Melissa Dahl in New York Magazine's Science of Us: 

In one  2007 study, researchers conducted interviews with the friends and family members of people who had recently killed themselves. Without prompting, more than half of the deceased were described as “perfectionists” by their loved ones. Similarly, in a British study of students who committed suicide, 11 out of the 20 students who’d died were described by those who knew them as being afraid of failure. In another study,  published last year, more than 70 percent of 33 boys and young men who had killed themselves were said by their parents to have placed “exceedingly high” demands and expectations on themselves — traits associated with perfectionism.