An old unpublished post I just found: Wednesday's Child: which came first?

I was going through the ridiculous amount of drafts on my blog and found this one. I think I was probably going to write more but I decided to publish it anyway because I think it's an interesting idea...

I was just reading some statistics about depression and I came across something I've seen so many times before but this time it made me stop and pause. This is what I saw

Those with the following personality types are at risk of depression:
Lifelong worrier
Perfectionist
Sensitive to personal criticism
Unassertive
Low self-esteem
Self-critical and negative
Shy and socially anxious

And suddenly I wondered, are these personality types prone to depression, or are these personality types caused by depression? I'm sure I'm not the first person to wonder this, there are lots of much smarter brains than mine that spend a hell of a lot more time thinking about depression than I do.