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Figure 1 | BMC Infectious Diseases

Figure 1

From: Self-reported history of sexually transmissible infections (STIs) and STI-related utilization of the German health care system by men who have sex with men: data from a large convenience sample

Figure 1

Assessment of self-selection bias. SSB self-selection bias; Sstu, Spop: self-reported Syphilis diagnoses in the last 12 months in the study (stu)/Syphilis cases attributed to MSM in the primary surveillance data (pop); Nstu, Npop: Number of MSM in the study (stu)/in the German population (pop), the latter based on extrapolations from sexual behaviour surveys of the general population.

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