Table 5.

Multivariate Poisson Regression Model of 228 Spine Surgeries in 40,038 HIV Infected Patients

Variable		IRR	95% CI	P value
Age
	< 40	1.00	n/a	n/a
	40 – 49	1.16	0.82, 1.61	0.394
	50 – 59	1.13	0.76, 1.68	0.540
	60 – 69	0.74	0.37, 1.48	0.395
	≥ 70	0.42	0.10, 1.74	0.231
Race
	White	1.00	n/a	n/a
	Black	0.72	0.54, 0.96	0.025
	Hispanic	0.53	0.29, 0.97	0.041
	Other	0.16	0.04, 0.67	0.012
Comorbidity Score		1.27	1.14, 1.41	<0.001
cART		0.90	0.68, 1.20	0.488
CD4 cell count ≥ 200 cells/mm3		1.26	0.80, 1.98	0.306
Viral load ≥ 500 copies/ml		0.76	0.55, 1.05	0.099

^*Regression also adjusted for gender, year, baseline BMI, and baseline serum albumin and serum hemoglobin.

IRR = incidence rate ratio

CI = Confidence interval

cART = Combination anti-retroviral therapy