It seems this can be used to some extent as a measurement of whether the vertical growth of your maxilla is excessively long or falls within the range of normal:
http://www.google.com/patents/US5752523So if you feel like potentially being depressed, give it a shot!
cliffs for people too lazy to read:
1. get a ruler
2. measure the vertical distance between the incisal edge of one of your maxillary incisors and the most anterior soft tissue point of your nose (the part of the nose that projects furthest from the face)
3. average adult ranges are 36-39 mm for women, 40-44 mm for men. figures that deviate significantly from the averages suggest vertical maxillary excess.
can't say it's the most precise home measurement, but mine looks to be right at the 40 mm mark, give or take a couple mm for imprecision