No, but it's a good idea to get a second opinion. I'll have DH try it this weekend.
I took the test myself out of curiosity, and I came out an ITP, not an ITJ. Granted, I'm always right on the border of J and P when I take the adult version, but I am *always* a J. I've never been anything else, for as long as I can remember.
That makes me raise an eyebrow a bit. The INTJ description is more accurate of me, I think. I'm a messy but organized person because I'm visually oriented, and my messiness drives me nuts. So I'm a J with P tendencies. This test ignores all that in a way that the adult version doesn't. So I wonder if some of the organization-centered questions on the kids' test don't necessarily apply as we get older.
Testing again in 15 years and meeting back here sounds good to me!