Table 5.

Odds ratios for significant risk factors in SOI analysis.

Factor	LOS (Days)			Cost (dollars)
	β	P-value	95% CI	β	P-value	95% CI
Major+	1.36	.001	0.53 to 2.19	6234	<.001	3577 to 8891
Minor	−0.12	.300	−0.34 to 0.11	−444	.245	−1194 to 306
Spinal	0.14	.427	−0.21 to 0.49	324	.584	−737 to 1385
Revision	1.07	.003	0.37 to 1.76	3623	.001	1548 to 5698
Medicaid	0.23	.207	−0.13 to 0.58	51	.927	−1045 to 1146
Medicare	0.49	.033	0.04 to 0.93	1093	.095	−191 to 2377
African-American	0.06	.310	−0.33 to 0.45	−356	.553	−1535 to 823
Other	0.61	.128	−0.18 to 1.40	1707	.317	−1644 to 5058
Female	0.46	.009	0.11 to 0.80	255	.621	−760 to 1271
Age	0.004	.631	−0.01 to 0.02	13	.620	−38 to 65
BMI	0.003	.818	−0.02 to 0.02	35	.342	−38 to 110