When you’re extracting data, you can often gather the same information for the intervention and the comparator.
That’s because, as you might remember, the comparator is just another intervention, a placebo, or the standard treatment for a specific disease or condition. In other words, it’s whatever the research study is using as a comparison for the intervention.
In fact, we often use the word “arm” to describe both the comparator and the interventions, where each “arm” represents a different treatment approach. A study may have several arms if several different treatments are being compared. You’ll want to extract the same type of data for each arm, so you can create a fair comparison between each approach.