Table 1

Logistic univariable and multivariable regression analysis of factors associated with STI acquisition among MSM participating in the Amsterdam Cohort Studies between 2009 and 2019

Sexual behaviour factorsUnivariable n=971 MSM/13 473 visitsMultivariable n=959 MSM/12 274 visits
OR95% CIP valueOR95% CIP value
Number of insertive casual partners1.641.56 to 1.73<0.0011.201.12 to 1.30<0.001
Number of receptive casual partners1.751.67 to 1.84<0.0011.331.23 to 1.43<0.001
Condomless insertive sex (yes)2.822.51 to 3.18<0.0011.251.04 to 1.500.02
Condomless receptive sex (yes)3.292.91 to 3.71<0.0011.351.12 to 1.630.001
AI during group sex (yes)2.191.94 to 2.46<0.0011.140.98 to 1.330.08
Chemsex (yes)2.502.21 to 2.83<0.0011.611.40 to 1.85<0.001
Steady partnership (no)1.561.39 to 1.75<0.0011.371.20 to 1.56<0.001
  • Continuous variables including partner numbers were log transformed. Visits with one or more missing sexual behaviour factors were excluded from multivariable analysis. STI acquisition is defined as gonorrhoea, chlamydia or syphilis diagnosis at one or more anatomical locations.

  • Created by the authors.

  • AI, anal intercourse; ; MSM, men who have sex with men.