Two if my neighbours asked about DS's results. I told them they weren't out yet. They don't know whether he's low, high or average ability, they just know that he's 16 and I felt they were just being polite, in the way I was when I asked them if they had a nice holiday.
I feel a bit awkward now because I have always asked if I remembered, and, tbh, I'm no more interested in the answer sometimes than I am in hearing that the weather was sunny in France and they had a couple of day trips. I had no idea people might think I'm being nosy. Now, I will have to put some guesswork into whether they might take offence and how to phrase it to be as neutral as possible.