Using the Astra to measure a person's height

I am trying to get the height of a user in unity. I have been trying to use world position and taking the difference between the y position of the head and the y position of the foot but the height seems to change based on how close the person is to the camera as well as the angle of the camera itself.

Also joints has an object inside of it called DepthPosition and it has an X and a Y but i cant for the life in me figure out what those are in relation to real world coordinates.

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