Demographic and clinical characteristics of participants by cluster based on MLST of Chlamydia trachomatis, STI outpatient clinic, Amsterdam, July 2008–May 2010.

MLST: multilocus sequence typing; MSM: men who have sex with men; MSMO: men who have sex with men only; MSMW: men who have sex with men and women; MSWO: men who have sex with women only; STI: sexually transmitted infections; IQR: interquartile range. ptotal represents the p-value for the analyses over all clusters and the residual group; pI to IV over MSM-associated clusters, i.e. clusters I–IV and pV to VIII+R over heterosexual-associated clusters, i.e. clusters V–VIII and the residual group. aData were missing for 1 sample from cluster I, 1 from cluster III, 1 from cluster IV and 1 from cluster VI. bData were missing for 2 samples from cluster I, 5 from cluster II, 2 from cluster IV, 2 from cluster V, 3 from cluster VI, 1 from cluster VIII and 3 from the residual group. cData were missing for 3 samples from cluster I and 3 from cluster II. dData were missing for 5 samples from cluster I, 2 from cluster II, 2 from cluster IV, 2 from cluster VI and 1 from cluster VII.