statistic would be what we would expect even if volunteering

statistic would be what we would expect even if volunteering does not boost longevity.would用法?
When people engage in activities that help others ,their brain releases endorphins,
the brain’s natural opiates,which induce in people a feeling of well-being.It has
been suggested that regular release of endorphins increases people’s longevity.
And a statistic on adults who regularly engage in volunteer work helping others
shows that they live longer,on average,than adults who do not volunteer.How-
ever,that statistic would be what we would expect even if volunteering does not
boost longevity,because.
在这里would是引导什么mood的句子?为什么这样用?
that statistic would be what we would expect even if volunteering does not
boost longevity,这句话如何翻译