Earlier quoted context omitted.
There is a selection bias issue here. E.g. if there were some underling genetic disorder that causes anxiety, then that person is less likely to join a group.
Eh, I would say most new scouts are pretty anxious, and they also potentially come with other issues like asthma that likes to flare up, seizures, diabetes, etc. having had to deal with patrol members with these issues, sometimes 2 having one of these issues at the same time out of a group of 6 or 7. Generally you deal with it as quickly & safely as possible, get the rest of your patrol to rally and do what is needed…
Or just switch anxiety for depression - i.e. everyday depression and 'clinical' depression are not the same thing.