---
title: Filter your patients to study a subgroup
description: You can use filters to select subsets of your patients and analyze them separately. For example, you can select patients whose age is below 70 or female…
---
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# Filter your patients to study a subgroup
You can use filters to select subsets of your patients and analyze them separately.
*For example, you can select patients whose age is below 70 or female patients.*
**Filters are persistent**. When you activate one filter, it will be active on every page of the site, until you deactivate it.
**Filters are additive**. When you activate 2 or more filters, they combine together.
*For example, you can select patients whose age is below 70 AND whose gender is female.*
*The « OR » operator is not available yet.*
## How to filter patients?
You can filter your patients in every way you want.
A filter is composed by:
- A variable: *eg. "Age"*
- An operator: *eg. "Is inferior to"*
- ± A value: *eg. "45 years"*
This will allow you to filter patients younger than 45 years.
**To create a custom filter, follow these steps:**
On any page of the application click on the "+ Add filter" button
1. Choose the variable you want to filter on, the operator ± the value.
2. Confirm to activate the filter
3. Your series is now filtered
## How to know if a series is filtered?
The filters will now appear in the "Active filters" panel at the top of the page with green tags like:
If you put the mouse cursor over the filter tag, you can see the details of your filters.
There is much more you can do with filters:
- How to [remove a filter](https://help.easymedstat.com/support/solutions/articles/77000176617-how-to-remove-a-filter-?hsLang=en)?
- How to [save a filter for later use](https://help.easymedstat.com/support/solutions/articles/77000586653-save-filters-for-later-use?hsLang=en)?
- How to [reuse a filter](https://help.easymedstat.com/support/solutions/articles/77000176710-how-to-reuse-a-filter-you-already-created-?hsLang=en)?
- How to [make a filter accessible to your colleagues](https://help.easymedstat.com/support/solutions/articles/77000176776-how-to-create-a-quick-filter-for-your-colleagues-?hsLang=en)?
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