Whoops! My response to Aida was confused! Thanks for asking about this Eric!
The HS+ and HS-- columns in 7f should indeed refer to those who do and do not have HS.
I now understand the reason for Aida's question, which was whether the table should include everyone, or just those with HS index positive. The answer is that the table for 7f should include everyone. If we are trying to decide whether to do the HS index, we can't assume we know its result at the time we are making the decision to do it!
Sorry about my earlier confused and confusing answer.
Tom