23, 5ft 11.5in (Hey, the doctor's the one who's always like "11 and a half", not me! Then I'm always tempted to say "You mean 11.5323in")

1/2 inch is still more than one centimeter, so I can imagine that to stay within the tolerance that is used for tracking height globally, this level of detail is necessary. (doctors in places that use sane measurement systems usually round to either the centimeter or 1/2 centimeter even, which is +/- 1/5th of an inch).

Yup 23 is what I expected :)