Table 3.

Correlation matrices with 95% CIs in parentheses

Variable	30-Day		1-Year
	r (95% CI)	p-value	r (95% CI)	p-value
Epidural abscess	-0.146 (-0.359 to 0.083)	0.209	0.092 (-0.136 to 0.311)	0.429
Spondylodiscitis	-0.118 (-0.334 to 0.110)	0.310	-0.021 (-0.246 to 0.205)	0.855
No. of levels	-0.085 (-0.304 to 0.143)	0.466	0.334 (0.117 to 0.520)	0.003
Surgical intervention	-0.070 (-0.291 to 0.158)	0.549	-0.110 (-0.328 to 0.118)	0.342
Age	0.121 (-0.107 to 0.338)	0.296	0.286 (0.064 to 0.480)	0.012
Axial pain	0.021 (-0.206 to 0.245)	0.860	0.064 (-0.164 to 0.285)	0.582
Radiculopathy	-0.102 (-0.320 to 0.126)	0.380	0.201 (-0.026 to 0.408)	0.082
Myelopathy	0.096 (-0.132 to 0.315)	0.409	-0.099 (-0.317 to 0.129)	0.395
Para/quadriplegia	0.216 (-0.270 to 0.180)	0.682	0.216 (-0.010 to 0.421)	0.062
Intravenous drug abuse	-0.048 (-0.270 to 0.180)	0.682	0.216 (-0.010 to 0.421)	0.062
Diabetes mellitus	0.040 (-0.187 to 0.263)	0.732	-0.011 (-0.236 to 0.251)	0.475
Cancer	-0.092 (-0.311 to 0.137)	0.431	0.165 (-0.063 to 0.376)	0.459
Chronic renal failure	0.332 (0.116 to 0.519)	0.003	0.047 (-0.180 to 0.270)	0.684
Hepatitis B/C	-0.081 (-0.301 to 0.147)	0.488	0.022 (-0.205 to 0.246)	0.853
Methicillin resistant Staphylococcus aureus	-0.069 (-0.290 to 0.159)	0.554	0.194 (-0.033 to 0.402)	0.093
Modified Frailty Index	0.400 (0.192 to 0.574)	<0.001	0.144 (-0.084 to 0.358)	0.213
Hemoglobin	0.045 (-0.182 to 0.268)	0.698	-0.055 (-0.277 to 0.173)	0.639
White cell count	-0.015 (-0.240 to 0.211)	0.896	-0.089 (-0.308 to 0.140)	0.446
Albumin	-0.113 (-0.330 to 0.115)	0.330	-0.093 (-0.312 to 0.135)	0.423
C-reactive protein	0.031 (-0.196 to 0.255)	0.791	-0.082 (-0.302 to 0.146)	0.480
Blood culture	-0.112 (-0.329 to 0.117)	0.337	0.109 (-0.119 to 0.326)	0.349

Statistically significant findings highlighted in bold.

CI, confidence interval.