Table 2. Model base case clinical values and ranges used for sensitivity analyses.

	Variable	Base Case (range)	Source
Demographic	Age of sex work initiation	19 (16–25)	[15]
Epidemiological values	HIV/STI combined incidence:
	Among FSW-IDU in Tijuanaa	64.3 (34.6–93.9)	[16]
	Among FSW-IDUs in Cd. Juareza	66.1 (30.2–102.0)	[16]
	Calculated HIV injection risk:
	HIV prevalence among used syringesb	12.3% (6–19%)	[43, 44]
	Receptive sharing of contaminated syringeb	0.667	[44, 45]
	Shared contaminated cotton/cooker/waterb	0.0067	[45]
	Contaminated syringe cleaned with bleachb	0 (0–21)	[45]
Utilities	QALYsc lost per STI episode	.005 (.003-.0089)	[3]

^aPer 100 person years

^bPer 100 exposures

^cQuality Adjusted Life Years