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. Author manuscript; available in PMC: 2015 Oct 15.
Published in final edited form as: Spine (Phila Pa 1976). 2014 Oct 15;39(22):E1291–E1296. doi: 10.1097/BRS.0000000000000540

Table 2.

Summary of experimental and predicted fracture loads and stiffness for each group.

Groups Fracture Load (N)
(mean (SD))		 Coefficient of
Determination
(R2)		 Stiffness (N/mm)
(mean (SD))		 Coefficient of
Determination
(R2)
Measured Predicted P-value Measured Predicted P-value
Intact
(n=4)		 2185
(906)		 1747
(702)		 0.375 0.48 2913
(362)		 1755
(837)		 0.137 0.80
Negative
(n=10)		 3278
(2153)		 3237
(1744)		 0.906 0.76 3509
(1712)		 3037
(1677)		 0.403 0.50
Co-polymer
(n=15)		 3220
(1754)		 3484
(1497)		 0.206 0.81 4121
(2249)		 3347
(1413)		 0.116 0.61
PMMA
(n=7)		 4211
(1698)		 3960
(1371)		 0.296 0.90 5056
(2240)		 4097
(2076)		 0.180 0.70