Help filtering cases

I have 11 variables, in which 3 out of 11 variables have missing cases. I need to filter out the missing cases to make my sample size consistent across all variables.

For context, the population size is 5985.

The variable with the smallest (n) is 5331.

I tried filtering cases by doing:
NOT MISSING AND (var 1) AND NOT MISSING (var 2)….

After doing this, my (n) is 4909 (consistent to all 11 variables.

However, I think this is too small given that I am doing a test of association.

Did I do the filter correctly?