The data you extract depends on the question you're trying to answer. Different research questions have different data needs. Typical data elements often include:
The data you extract goes into your evidence and summary tables. These can include:
To evaluate the quality of evidence for each outcome, use GRADE. It classifies the evidence in four levels (very low to high) and offers 2 grades of recommendations: "strong" and "weak."
There are many tools to extract data. You can create your own form in Word or Excel. Some software helps you do it, but you still have to input which data you want to extract: