I first tried this query and the returned count of Injury was 9.
Then I added the field adverse_event_flag:Y and used the following query. The returned count of injury changed to 6.
I thought that, when event_type is Injury, it always indicates that the event has resulted in an adverse outcome in a patient. That is, the count of injuries should be the same by running these two queries. Why does the second query return smaller count? Thanks.