“driven by” and “at which”

[haitaohu]

This sentence is from The Economist. Could you tell me,what a role that “driven by” and “at which” play?


According to the Centres for Disease Control and Prevention (CDC) overall life expectancy fell for the second time in three years in 2017, driven by a surge in opioid overdoses and suicide(自杀), at which whites are most at risk.

 

[grassy]

... (which was) driven by (= mainly caused by) a surge in opioid overdoses and suicide.

Your other question needs a separate thread.

 

[haitaohu]

... (which was) driven by (= mainly caused by) a surge in opioid overdoses and suicide.

Your other question needs a separate thread.

Thanks for you answer，and I want to know whether the which in (which was) is in place of the whole sentence(According.....,2017) or not?

 

[grassy]

Yes, but without the 'According to...' part.

Which there refers to the fact that overall life expectancy fell for the second time in three years in 2017.

 

[haitaohu]

what you said is excaly what I thought，Would you mind talking about some grammar？Why do we omit the “whcih was”？

Yes, but without the 'According to...' part.

Which there refers to the fact that overall life expectancy fell for the second time in three years in 2017.

 

[grassy]

It's an example of a reduced relative clause.

 

[haitaohu]

It's an example of a reduced relative clause.

Love you，bro！Hope you can come to China！