How large is your sample size?

I've met probably ~100 LWers in person, but I notice that I was falling prey to confirmation / availability bias when writing the grandparent post. When I met up with Fluttershy for lunch in a restaurant, he took out the bottle of hand sanitizer he kept in his backpack, and that counted more heavily in my memory than the Seattle LW game night / group meal hosted at jsalvatier's place, where if I recall correctly people washed their hands in the sink if they wanted to, rather than there being some sort of explicit cleanliness norm, despite there being two LWers at the first event and ~twelve at the second. I can't recall a time when I thought a LWer was behaving in an obviously unclean manner, though, but that's rare enough anyway among people I'm around that I don't know how much evidence that is. (Thinking of the group I'm close to with the least overall healthiness, as evidenced by the prevalence of drinking, smoking, and (I'm pretty sure) promiscuity, even they throw out unrefrigerated leftovers with meat in it because of the influence of one of the members with a food service job (and thus the associated food safety training).)