Table 1

Characteristics of included studies and participants

Study	Year(s)	Encounters (n)	Recruitment	HIV+ (%)	White (%)	Black (%)	Hispanic (%)
Chiasson et al38	2003–2004	1662	Online	8	78	5	7
Grov et al14	2004–2005	2796	Online	16	80	4	9
Menza et al41	2003–2006	846	Offline	19	86	<5*	3
MINTS II12 42 43	2005	4547	Online	45	27	16	25
Mustanski49	2004	530	Online	4	96	5	3
NHBS I39	2003–2005	3177	Offline	20	45	17	27
NHBS II40	2008	13 665	Offline	0†	44	24	25
SILAS W436 37	2008	11 221	Online	12	80	<8*	15
Smith et al46	2002–2005	572	Offline	100† (53)^‡	70	<31*	<31*
Tieu et al47	2008–2009	328	Mixed	63	0	100	0
Wilson et al48	2007	258	Offline	100†	22	53	25

*Specific proportion not available.
†*Authors excluded persons of HIV-positive or HIV-negative serostatus from sample.
‡53.3% of encounters occurred after HIV diagnosis and are represented in the HIV+ subgroup UAI model; prediagnosis outcomes were not included in subgroup models because perceived serostatus in prediagnosis encounters was unavailable.
NHBS, National HIV Behavioral Surveillance; UAI, unprotected anal intercourse.