Populations data selection
This option is only available when the population of interest is explicitly defined, use the Use data option and select a data source. Select one of the available populations in the Populations selection pane.
![../../../_images/populations-data-selection.png](../../../_images/populations-data-selection.png)
Figure 26 Population data selection (Use Data).
![../../../_images/populations-selection.png](../../../_images/populations-selection.png)
Figure 27 Available population data: change selection.
Selecting two or more populations, initiates a loop over multiple populations. Check the Loop over multiple populations : checkbox. See also Figure 29
![../../../_images/loop-multiple-populations-data-selection.png](../../../_images/loop-multiple-populations-data-selection.png)
Figure 28 Loop over multiple populations (Use Data).
![../../../_images/results-loop-multiple-populations.png](../../../_images/results-loop-multiple-populations.png)
Figure 29 Results pane with loop over multiple populations (Use Data).