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

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