Possible Indicators of Mental Health

An idle thought:

I would be very interested to see a chart of things which may be indicators of my mental state. Some possible questions:

How clean is the inside of my vehicle?
How long has it been since I blogged?
When was the last time I sat down and read for enjoyment?
How many items do I have that I am meaning to put in postal mail?

Not a complete list, mind you.