Table 3.

Logistic regression analysis of risk factors associated with S1 screw loosening

	Odds ratio	95% CI for OR	P value
Age	0.153	1.004–1.351	0.044
Instrumented levels	0.071	0.716–1.608	0.731
Osteoporosis (Yes/No)	2.511	2.513–60.31	0.002
Hypertension	1.511	0.767–26.759	0.095
Coronary artery disease	22.121	<0.001	0.999
Changed TPA (°)	−0.042	0.854–1.077	0.481