Table 1.

Model input parameters and costs.

Parameter			Value	Range	Data source
Both groups
		HIV infection rate	0.073	—a	Qin et al [14]
		HIV infectivity rate of one homosexual behavior	0.008	0.002-0.02	Vittinghoff et al [15]
		Rate of condom effectiveness	0.95	0.69-0.99	Pinkerton and Abramson [16]
		The average number of sexual behaviors with each sexual partner, n	6	1.2-13.2	Zhang et al [17]
		QALYsb saved per HIV infection averted, n	10	—	Hu et al [18]
		Lifetime medical costs after HIV infection (US $)	25,803.41	—	Wang et al [20]
		Discount rate, %	3	—	Wilde and Parke [19]
Control group
	Epidemiology
		Number of sexual partners, mean	6.01	—	Yun et al [12]
		Use rate of condoms for each sexual behavior	0.7	—	Yun et al [12]
		Infection probability	0.007	—	Calculated
	Costs (US $)
		Recruitment spending	156.25	—	Observed
		Condoms and lubricant	—	—	Observed
		HIV self-test kits and supporting supplies	—	—	Observed
		HIV risk–assessment software development	—	—	Observed
		Human capital cost	843.75	—	Observed
		Communication fees and electricity charges	93.75	—	Observed
		Computers	1250	—	Observed
		Online survey and intervention system	—	—	Observed
		Office supplies (eg, paper and pens)	15.63	—	Observed
Intervention group
	Epidemiology
		Number of sexual partners, mean	3.51	—	Yun et al [12]
		Use rate of condoms for each sexual behavior	0.86	—	Yun et al [12]
		Infection probability	0.0022	—	Calculated
	Costs (US $)
		Recruitment spending	156.25	—	Observed
		Condoms and lubricant	70.31	—	Observed
		HIV self-test kits and supporting supplies	93.75	—	Observed
		HIV risk–assessment software development	93.75	—	Observed
		Human capital cost	843.75	—	Observed
		Communication fees and electricity charges	93.75	—	Observed
		Computers	1250	—	Observed
		Online survey and intervention system	87.5	—	Observed
		Office supplies (eg, paper and pens)	15.63	—	Observed

^aNot reported.

^bQALY: quality-adjusted life-year.