Out of this subset involving power loss, there were 437 pilot deaths, or 5.2 percent. There were some identifiable risk factors that increased the fatality rate. The results are about what you d expect. Crashing without a shoulder harness is bad. If the aircraft is destroyed or catches fire, that is very bad.
Several factors involving the physics of higher landing speed and weight come to mind.
These aircraft also spend more time on cross-country flights away from the relative safety of airports. A few other factors were not so immediately obvious. Less obvious is that those without current flight reviews have a risk that is twice as great as those who were legally current. Pilots with total flight time between 201 hours and 1,000 hours had more risk than those with more or less flight time. The correlation may not imply the causality, but it certainly corresponds with the concept that a little knowledge is a dangerous thing.