Table 4C.

Multivariate logistic regression^*. Any minor adverse event: superficial infection, ecchymosis, erythema, incision site drainage, spinal headache, and poor wound healing.

Variables	OR	95% CI	p
SLE vs OA	3.54	1.41–8.91	0.007
Charlson-Deyo Comorbidity Index^**, ≥ 1 vs 0	1.19	0.46–3.12	0.72
Epidural block vs no	1.91	0.37–9.86	0.44

↵* All models control for disease (SLE vs OA), comorbidities, and type of anesthesia.
↵** The Charlson-Deyo Comorbidity Index was calculated by excluding SLE. Significant data are in bold face. SLE: systemic lupus erythematosus; OA: osteoarthritis.