Table 4.

Multivariate Poisson Regression Model of 1,012 Spine Surgeries in 111,047 HIV Infected and Uninfected Patients

Variable		IRR	95% CI	P value
HIV infected		0.61	0.51, 0.74	<0.001
Age
	< 40	1.00	n/a	n/a
	40 – 49	1.25	1.06, 1.47	0.007
	50 – 59	1.06	0.89, 1.29	0.567
	60 – 69	0.69	0.49, 0.97	0.034
	≥ 70	0.15	0.06, 0.42	<0.001
Race
	White	1.00	n/a	n/a
	Black	0.74	0.64, 0.85	<0.001
	Hispanic	0.56	0.42, 0.73	<0.001
	Other	0.31	0.19, 0.53	<0.001
Selected Comorbidities	Alcohol abuse	1.00	0.81, 1.24	0.998
	CHF	0.54	0.25, 1.18	0.121
	Diabetes	1.17	0.93, 1.46	0.176
	Drug abuse	1.03	0.83, 1.28	0.795
	Hepatitis C	0.94	0.63, 1.33	0.716
	Hypertension	1.25	1.06, 1.48	0.009
	Osteoarthritis	2.28	1.96, 2.90	<0.001

Note: Regression also adjusted for gender, year, additional baseline comorbidities (atrial fibrillation, cancer, chronic obstructive pulmonary disease, cirrhosis, coronary artery disease, hepatitis B, hyperlipidemia, major depression, peripheral vascular disease, post-traumatic stress disorder, renal insufficiency, schizophrenia, stroke, transient ischemic attack), baseline BMI, and baseline serum albumin and serum hemoglobin.

IRR = Incidence rate ratio

CI = Confidence interval

CHF = Congestive heart failure