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"Measure vertically from the bottom of the buttocks up to the collarbone. The average wheelchair back height is 16 inches. The backrest height will ultimately depend on the user, if they have trouble sitting upright, they might want a lower back. If they want to push themselves around \r\nin their wheelchair, they will probably prefer a lower back so their arms can move freely. "
<https://www.discountramps.com/how-to/mobility/measure-manual-wheelchair/a/b95/>