Table 4. Risk factors for atazanavir-associated urolithiasis, multivariate analysis.

	OR		95% CI	p
MAIN MODEL WITH 3 VARIABLES
Duration of ATV (per year)		1.32	0.95–1.84	0.10
Serum free bilirubin level (per 2-fold increase)		2.31	1.18–4.52	<0.02
Previous history of urolithiasis		3.66	0.88–15.2	0.07
ALTERNATIVE MODELS WITH 2 VARIABLES
Serum free bilirubin level (per 2-fold increase)		1.94	1.12–3.36	<0.02
Previous history of urolithiasis		4.79	1.44–15.98	<0.02
Duration of ATV (per year)		1.42	1.04–1.93	<0.03
Serum free bilirubin level (per 2-fold increase)		2.66	1.35–5.21	<0.01