The data you extract will be slightly different depending on the type of intervention/comparator in each study. Here are are few examples of the key data to extract:
For a medical intervention/comparator:
Doses of those drugs
How were drugs administered (swallowed pill? In an IV? Any titration protocols?)
How frequently and how long did participants receive the drugs?
For a surgical intervention/comparator:
Type of surgery
Details about how surgery was performed
Type of materials used in the surgery
Experience level of the surgeon(s)
For an exposure (such as second hand smoke)
Type of exposure
Duration of exposure
Intensity of exposure
Mechanism of exposure
How recent was the exposure?
You might see the comparator described as inactive, placebo or “usual care.” This isn’t enough information. Be sure to gather specific data on what the comparator was and how it was administered.