Peter Attia· MD
so um and there's some debate about whether you can only have one primary outcome or whether you can have co-primary outcomes but the primary outcomes are basically the outcomes for which the study is designed around and powered against again we will come to this idea of power in a moment um but there are lots of secondary outcomes and they're often exploratory so it's really important that when people are pre-registering studies they State what the primary outcome is and what the secondary outcomes are and typically a study that fails to meet its primary outcome will be deemed a null study even if it meets secondary outcomes