Table 1.

Sexual risk behavior (SRB) score.

Score	Label	Description
0	No IAI or RAI	No IAI or RAI since the last visit
1	No UIAI or URAI	Only protected IAI or RAI since the last visit, regardless of the number of reported IAI or RAI partners or the HIV status of those partners
2	Only UIAI	Only unprotected IAI since the last visit, regardless of the number of reported IAI or RAI partners or the HIV status of those partners
3	URAI with one HIV− partner	Only 1 partner since the last visit and condoms were not used every time during RAI with that partner (regardless of condom use during IAI), but the partner was HIV−
4	Condom Serosorting	RAI only or IAI and RAI since the last visit (multiple partners) Condoms not used every time with ≥1 RAI partner, but RAI partners with whom condoms were not used were all HIV− AND Condoms not used every time with ≥1 IAI partner, but IAI partners with whom condoms were not used were all HIV− OR Condoms used every time with all IAI partners OR No IAI partners
5	Condom Seropositioning	IAI and RAI since the last visit (multiple partners) Condoms not used every time with ≥1 RAI partner, but RAI partners with whom condoms were not used were all HIV− Condoms not used every time with ≥1 IAI partner and ≥ 1 partner was HIV+/HIV status unknown
6	No Seroadaptive Behaviors	RAI only or RAI and IAI since the last visit (1 partner or multiple partners) Condoms not used every time with ≥1 RAI partner and ≥ 1 partner was HIV+/HIV status unknown, regardless of the number of IAI partners, condom use during IAI or the HIV status of IAI partners

HIV − = HIV-negative; HIV+ = HIV-positive; IAI = insertive anal intercourse; UIAI = unprotected insertive anal intercourse; RAI = receptive anal intercourse; URAI = unprotected receptive anal intercourse.