Introduction Spectrum-STI is a statistical trend-fitting model designed for countries to estimate trends over time in the prevalence and incidence of three sexually transmitted infections (STIs): syphilis (etiologic agent: Treponema pallidum subspecies pallidum ); gonorrhea ( Neisseria gonorrhoeae ); and chlamydia ( Chlamydia trachomatis ) from available prevalence data after standardizing for diagnostic test, location and age and weighted to reflect representativeness.
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The Spectrum-STI Groups model: syphilis prevalence trends across high-risk and lower-risk populations in Yunnan, China.
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