Table 7.

Multiple regression analysis of the risk factors for implant removal

Variable	Not standardized coefficients		Standardized regression coefficients	t-value	p-value	95% Confidence interval
	Regression coefficient	Standard error	Beta
Preoperative data
Sex (male vs. female)	0.447	0.212	0.437	2.114	0.051	0.008 to 0.886
Age	0.005	0.008	0.142	0.599	0.555	-0.012 to 0.021
Segments of instrumentation	-0.054	0.049	-0.244	-1.094	0.286	-0,156 to 0.048
Region of spinal instrumentation	0.051	0.047	0.216	1.075	0.294	-0.047 to 0.148
Primary disease	0.112	0.119	0.189	0.946	0.354	-0.134 to 0.359
American Society of Anesthesiologists classification	-0.022	0.124	-0.036	-0.176	0.862	-0.278 to 0.235
Infection timing (early vs. late)	0.445	0.188	0.423	2.362	0.026*	0.057 to 0.833
Fever (yes vs. no)	0.118	0.234	0.105	0.504	0.619	-0.367 to 0.602
High white blood cell count (yes vs. no)	-0.177	0.281	-0.175	-0.630	0.535	-0.759 to 0.406
C-reactive protein	0.000	0.001	-0.047	-0.180	0.859	-0.003 to 0.002
Infection type (mono- vs. polymicrobial)	-0.443	0.215	-0.439	-2.056	0.052	-0.890 to 0.004

^*p <0.05; statistically significant.