stressful life event造句

Dear Tired: "the loss of a job is one of the most stressful life events," notes Jayne Mattson.

These studies also looked at the roles of stressful life events, genotype at the serotonin transporter gene, and the resulting depression risk.

I'd like them to be controlled for stressful life events if at all possible (say, a big class of undergrads all taking the same class, though that would have bias of its own).