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Table 1 P-values, showing significant differences within all pairs of study groups, formed between Group 1 (USS), Group 2 (POLY) and Group 3 (MONO), with regard to the initial and secondary torsional stiffness (the latter after 20,000 cycles)

From: Biomechanical investigation of a minimally invasive posterior spine stabilization system in comparison to the Universal Spinal System (USS)

Group pairs Torsional stiffness, Nm/deg
Initial Secondary
USS-MONO 0.002 0.002
USS-POLY 0.001 0.001
MONO-POLY 0.015 0.047