Table 2 Estimated incidence rate ratio of diagnosed newly acquired hepatitis C virus infection in HIV-positive men who have sex with men patients by HIV/genitourinary medicine clinic, 95% CI and p value estimated from the negative binomial regression model, January 2002–June 2006, London and Brighton

Factor	HIV clinics	Estimated incidence rate ratio	95% CI	p Value
Clinic	Royal Sussex County Hospital Brighton	1.67	0.80 to 3.47	0.02
	Eastbourne	0	–
	Hastings	0	–
	Beckenham Hospital	1.13	0.14 to 8.96
	Central Middlesex Hospital	1.02	0.13 to 8.08
	Charing Cross Hospital	0.67	0.24 to 1.88
	Chelsea & Westminster Hospital*	Reference
	Mortimer Market Centre (UCH)	1.84	0.93 to 3.64
	North Middlesex Hospital	0.36	0.05 to 2.83
	Royal Free Hospital HIV Clinic	2.27	1.14 to 4.49
	Royal London Hospital	2.35	1.12 to 4.92
	St George’s Hospital	0.56	0.17 to 1.83
	St Mary’s Hospital	1.52	0.75 to 3.09
	Guys and St Thomas’	1.38	0.65 to 2.93
	West Middlesex University Hospital	1.00	0.21 to 4.66
	Queen Elizabeth Woolwich Hospital	0	–
Year		1.20	1.04 to 1.39	0.01

UCH, University College Hospital.
*Joint two clinics.