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

Table 6 Formulas for estimating averted indirect costs (lost productivity) of chlamydia, gonorrhea, syphilis, congenital syphilis, and HIV

Indirect STI costs averted
Chlamydia	[(C_w)(0.925)(0.70)($148)] + [(C_m+ C_msm)(0.925)(0.70)($13)] + [(Ĉ_w + Ĉ_m)(0.5)($29)] + [(Ĉ_msm)(0.5)($10)]
Gonorrhea	[(G_w)(0.79)(0.70)($171)] + [(G_m+ G_msm)(0.9)(0.70)($34)] + [(Ĝ_w + Ĝ_m)(0.5)($29)] + [(Ĝ_msm)(0.5)($10)]
Syphilis	[(S_w+S_m+S_msm)($112)] + [(Ŝ_w+Ŝ_m+Ŝ_msm)(0.5)($112)]
Congenital syphilis	[X₁₃ + 0.7(X₁₄) + 0.3(X₁₅)] [(0.5)($60,421)]
Indirect HIV costs averted by reducing HIV transmission through treatment of STIs
Chlamydia	[(Ĉ_w + Ĉ_m)(0.0011)(0.25)(0.75)($831,614)] + [(Ĉ_msm)(0.0011)(0.25)(0.5)(0.25)($831,614)]
Gonorrhea	[(Ĝ_w + Ĝ_m)(0.0007)(0.25)(0.75)($831,614)] + [(Ĝ_msm)(0.0007)(0.25)(0.5)(0.25)($831,614)]
Syphilis	[(Ŝ_w + Ŝ_m)(0.02386)(0.25)(0.75)($831,614)] + [(Ŝ_msm)(0.02386)(0.25)(0.5)(0.25)($831,614)]
Indirect HIV costs averted by reducing HIV transmission through HIV counseling and testing
	[(X₁₂ + Y₁₂)(0.00045)(0.75)(0.875)($831,614)] + [(Z₁₂)(0.00045)(0.50)(0.25)(0.875)($831,614)]

The C_i, G_i, S_i, Ĉ_i, Ĝ_i, and Ŝ_i terms are defined in Table 3. The X_i, Y_i, and Z_i terms are defined in Table 2. Syphilis cases include primary and secondary (P&S) syphilis only.

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