Combining IF, AND and OR functions - need some guidance

Hi - trying to combine some functions to produce a result. Having no luck. Attached is a spreadsheet.

I need to determine if a Pain Score at either a Screening Visit or a Baseline Visit is an eligible score. The score must be between 40 and 80 and must have occurred at the Screening Visit or the Baseline Visit. It's either Eligible (40<=PAIN SCORE<=80) or it's Ineligible.

However, there are other visits too where these Pain Scores are obtained. Those should be Not Applicable because they have nothing to do with eligibility. 

I feel like I'm entering the right formula, but I get errors - either too many arguments or missing parenthesis.

Here is the formula I'm trying (A = Visit Name and B = Pain Score):  '=IF(OR(A1="Screening",A1="Baseline"),AND(B1>39,B1<81),"Eligible",if(and(B1<40,B1>80),"Not eligible","Not applicable"))

Any guidance for me?

Many thanks!

Nancy