Count values for each row with a unique ID - excel

Question

I have a bunch of rows in a table. Each row reflects an event in a patient. However, one patient can have experienced multiple events, so it's possible for there to be multiple rows with the same patient number. Now I'd like to count the amount of male patients in my database, without counting the ones that had multiple events multiple times. Each patient is identified by a unique patient ID that could be used for this.
This shouldn't be all that complicated if not for the fact that I'm using a table that also has several filters, so I need to use SUBTOTAL for any counting functions.
I literally have no idea where to start, so I can't really provide any code...
Any function that could point me in the right direction would be greatly appreciated.
Thanks for the help.
~Laurens

Answer 1

Use a Pivot Table to filter and count all your patients database. Select your data and select Insert -> Tables -> Pivot Tables. Put your filters at the Filter section of the table and the Patient ID in the Rows section. Then, you can use COUNT to get the number of patients.
For more information about Pivot Tables, you can check this: https://support.office.com/en-us/article/Create-a-PivotTable-to-analyze-worksheet-data-a9a84538-bfe9-40a9-a8e9-f99134456576

Answer 2

To get the number of unique IDs in the same column, if the IDs are numeric, you can use SUM with FREQUENCY:
=SUM(IF(FREQUENCY($A$1:$A$1000,$A$1:$A$1000)>0,1))
If they're text and numbers mixed, you can get unique IDs with this one:
=SUM(IF(FREQUENCY(MATCH($A$1:$A$1000,$A$1:$A$1000,0),MATCH($A$1:$A$1000,$A$1:$A$1000,0))>0,1))
(From here)

Answer 3

Here you go
You've not mentioned whether an event is optional.
You might want to add extra column H with formula like h2=if(c2="",0,1) with 1/0 and multiply it as well in G.
Basically if column G contains a 1 you include it
Here's what the results of the formula look like:
Revision
Table is sorted by Patient id..
on change of patient id column H contains a 1, it'll be 0 otherwise.
So H2 is hard coded to 1, H3,H4,H6 will evaluate to 1.
So now G2=H2*E2 etc. You can filter by column H.
The beauty of mapping things into binary zeros and ones is you can do multiplication to achieve a logical AND result, whilst at the same time breaking a complex task into a series of steps. You can then apply a filter to the data to get the rows where column G are not zero, and see the totals count. Normally I'd insert a column between header and data on row 2 and then have G2=SUM(G3:G9)
Sum column H for number of patients.