The presentation they're referring to is at [1]. I wasn't able to find a transcript or a video, perhaps it's necessary to become a member. What I'd be interest

The presentation they're referring to is at [1]. I wasn't able to find a transcript or a video, perhaps it's necessary to become a member. What I'd be interested in is how they deal possible confounding. Eg, that sick people tend to visit doctors more and sick people tend to have more health problems. Or, that people who have cardiac arrests tend to have other health issues. Is anyone with access able to help? [1] https://programme.escardio.org/ESC2020/Abstracts/220608-contacts-to-the-healthcare-system-prior-to-out-of-hospital-cardiac-arrests https://programme.escardio.org/ESC2020/Abstracts/220608-cont...