Make all desired selections and click any of the Find buttons to do a search.
Data as of September 8, 2023
PRR (Proportional Reporting Ratio) / Chi-Square Analysis
PRR / Chi-square analysis examines a vaccine and an event outcome to see if the vaccine has
a statistically significant relation to that event.
Four numbers are gathered in the analysis:
To do an analysis, choose a Vaccine to Analyze (in Section 3, Vaccine Information),
then choose the Comparison Situation where the vaccine was not given. This defaults to being all cases
where the vaccine is not mentioned, but you can choose a specific alternative vaccine instead.
You can also use the vaccine name field to distinguish sub-types (such as manufacturer).
Next, choose an Event (below), either a symptom or a characteristic:
No Event Analysis
Limit the analysis by Event Characteristics (Section 4), Demographics (Section 5), or Dates (Section 6).
Limit the analysis by Demographics (Section 5) or Dates (Section 6).
Click any Find button to do the analysis.
Custom Age Ranges
Or fill in this formula for age breaks: