[ENH] Added a subsection for participant-level results tsv in aggregate mode

docs/infrastructure.md

@@ -144,7 +144,8 @@ For a local deployment, we recommend to **explicitly set** at least the followin
 The `NB_API_ALLOWED_ORIGINS` variable defaults to an empty string (`""`) when unset, meaning that your deployed API will only be accessible via direct `curl` requests to the URL where the API is hosted (see [this section](#test-the-new-deployment) for an example `curl` request).
 
 However, in many cases you may want to make the API accessible by a frontend tool such as our [browser query tool](https://github.com/neurobagel/query-tool).
-To do so, you must explicitly specify the origin(s) for the frontend using `NB_API_ALLOWED_ORIGINS` in `.env`. 
+To do so, you must explicitly specify the origin(s) for the frontend using `NB_API_ALLOWED_ORIGINS` in `.env`.
+For detailed instructions regarding the query tool see [Running cohort queries](query_tool.md).
 
 For example, the [`.template-env`](https://github.com/neurobagel/api/blob/main/.template-env) file in the Neurobagel API repo assumes you want to allow API requests from a query tool hosted at a specific port on `localhost` (see the [Docker Compose section](#docker-compose)).
 

docs/query_tool.md

@@ -126,3 +126,11 @@ This number will be the same across rows corresponding to the same subject.
 Example:
 
 {{ read_table('./repos/neurobagel_examples/query-tool-results/participant-level-results.tsv') }}
+
+#### `protected` participant-level results in aggregate mode
+
+If the values for all columns except for `DatasetID` and `SessionPath` in the participant-level results tsv are set to `protected`, this indicates the graph being queried has been configured (via its corresponding API) to return only aggregate information about matches (due to data privacy reasons). This configuration can be modified by setting the `NB_RETURN_AGG` environment variable to `false` (the value is by default `true`). see related section of the documentation [here](https://neurobagel.org/infrastructure/#set-the-environment-variables).
+
+Example:
+
+{{ read_table('./repos/neurobagel_examples/query-tool-results/participant-level-results-agg.tsv') }}