Epidemiological characteristics of 42 men who have sex with men who tested hepatitis C RNA-positive, by phylogenetic cluster, Amsterdam, 2008–2009.

NOTE: The subculture characteristics are not mutually exclusive.RNA = ribonucleic acid; STI = sexually transmitted infection; HIV = human immunodeficiency virus; IQR = interquartile range; UAI = unprotected anal intercourse;1P-value for χ2-tests and Kruskal-Wallis tests of cluster I and II;2P-value for χ2-tests and Kruskal-Wallis tests of cluster I, II, and the remainder group;3Recreational use of cocaine, XTC, gamma hydroxybutyrate (GHB), ketamines, amphetamines, or methylamphetamines before or during sexual contact;4Based on serological evidence.