Well, I scored 21. It looks like it has apparent validity to me, for that trait. There are any number of traits that could be measured in a similar way. The thing to keep in mind I guess, is that this will probably fit a great many people, and refers (as the author states) to a normal trait. So if it is useful to you, great, but don't base your life around it.

<font color=green>"Loneliness does not come from having no people about one, but from being unable to communicate the things that seem important to oneself, or from holding certain views which others find inadmissible" Carl Jung</font color=green>