spinal length

spi·nal length (SL),

a measurement from the distal surface of the embryo where the plane passes through the developing eye (this is the cranial limit of the spinal cord) down to the rump (buttock).
Farlex Partner Medical Dictionary © Farlex 2012
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So though there are 50% patients in the group with 51 to 60 cms spinal length but the T4 level is achieved by only 33.33% patients which need not be from the same group.