Formulas for estimating the costs averted by sexually transmitted infection (STI) prevention programs in the United States

Table 2 Summary of STI program data needed to apply the averted cost formulas

	All women	Heterosexual men	Men who have sex with men
Number of people treated: lab-confirmed infection
Chlamydia	X₁	Y₁	Z₁
Gonorrhea	X₂	Y₂	Z₂
Syphilis	X₃	Y₃	Z₃
Number of people treated: clinical diagnosis
Chlamydia	X₄	Y₄	Z₄
Gonorrhea	X₅	Y₅	Z₅
Syphilis	X₆	Y₆	Z₆
Number of partners treated*
Chlamydia	X₇	Y₇	Z₇
Gonorrhea	X₈	Y₈	Z₈
Syphilis	X₉	Y₉	Z₉
Number treated presumptively for chlamydia, based on gonorrhea diagnosis	X₁₀	Y₁₀	Z₁₀
Number treated presumptively for gonorrhea, based on chlamydia diagnosis	X₁₁	Y₁₁	Z₁₁
Number of people receiving HIV counseling and testing	X₁₂	Y₁₂	Z₁₂
Number of pregnant women treated for syphilis, lab-confirmed diagnosis	X₁₃	not applicable	not applicable
Number of pregnant women treated for syphilis, clinical diagnosis	X₁₄	not applicable	not applicable
Number of pregnant women treated for syphilis, partner notification	X₁₅	not applicable	not applicable

*Refers to those treated because of sexual contact with an infected person. For example, X₇ refers to the number of women treated for chlamydia because of sexual contact with an infected person. Syphilis cases include primary and secondary (P&S) syphilis only.

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