> For the complete documentation index, see [llms.txt](https://support.who-umc.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://support.who-umc.org/vigilyze/disproportionality-analysis/stratified-disproportionality-analyses.md).
# Stratified disproportionality analyses
The “Disproportionality” tab allows you to explore how disproportionality values vary across different subsets of reports.
To access stratified analyses:
* Open the “Disproportionality” tab.
* Locate the stratified analysis section.
* Expand the rows of interest.
Results can be displayed as either tables or graphs.
In the graphs, credibility intervals are shownas whiskers that indicate the uncertainty around each disproportionality value.
#### Available stratifications
**Time**
\
Review cumulative disproportionality values over time. This can help identify changes in reporting patterns and determine whether reporting has increased, decreased or remained stable.
\
**Patient age**
\
Review disproportionality values across patient age groups. This can help identify differences in reporting patterns between age groups.
\
**Patient sex**
\
Review disproportionality values by patient sex. This can help identify sex-specific reporting patterns.
\
**Country**
\
Review disproportionality values for individual reporting countries. This can help identify geographical differences in reporting.
\
**Reporter qualification**
\
Review disproportionality values for individual reporter qualifications.
This can help identify differences in reporting patterns among, for example, patients.
#### Interpreting the results
Differences between stratified analyses may reflect differences in:
* Exposure
* Reporting behaviour
* Patient populations, healthcare systems and clinical practice
* Local reporting or coding practices
{% hint style="info" %}
Stratified disproportionality analyses should be interpreted together with qualitative review of the underlying reports.
{% endhint %}
---
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