Table 2.

Tabular overview of the averages and standard deviations of the results of mechanical testing without adjustment for covariates after both the initial fracture creation (PMMA and Modified PMMA groups only) and after fatigue testing broken down by experimental group

Group	N	Initial fracture force (N)	Initial specimen stiffness (N/mm)	Fatigue fracture force (N)	Cement stiffness (MPa)
Native	5	NA	NA	1,440 ± 590	NA
PMMA	5	2,854 ± 648	502 ± 129	1,760 ± 251	1,937 ± 478
Modified PMMA	6	1,980 ± 786	336 ± 125	1,583 ± 407	955 ± 141