The authors assessed the relative impact of structural and social influence interventions on reducing sexually transmitted infections (STIs) and HIV risk behavior among female sex workers in the Philippines (N = 897). Four conditions included manager influence, peer influence, combined manager-peer influence, and control. Intervention effects were assessed at the establishment level in multilevel models because of statistical dependencies among women employed within the same establishments. Control group membership predicted greater perceived risk, less condom use, less HIV/AIDS knowledge, and more negative condom attitudes. Combination participants reported more positive condom attitudes, more establishment policies favoring condom use, and fewer STIs. Manager-only participants reported fewer STIs, lower condom attitudes, less knowledge, and higher perceived risk than peer-only participants. Because interventions were implemented at the city level, baseline and follow-up city differences were analyzed to rule out intervention effects due to preexisting differences.
Keywordsfemale commercial sex workers; HIV/AIDS risk; social influence intervention; STIs; condom use Female commercial sex workers (FCSWs) are at high risk of transmitting HIV and sexually transmitted infections (STIs). This is particularly true in Asian countries, such as the Philippines. For instance, a recent large survey showed an exceptionally high prevalence rate of chlamydiosis among Filipino FCSWs ranging from 27% to 36% (World Health Organization, 2002). According to the survey, the principal mode of transmission was heterosexual contact (World Health Organization, 2002 HIV prevention has traditionally focused on using cognitive-behavioral individually oriented approaches to induce beneficial changes in the individual's attitudes, knowledge, and behaviors regarding HIV, with little attention to important structural-environmental factors that also account for individual behaviors (O'Leary, Holtgrave, Wright-DeAguero, & Malow, 2003). However, individualized prevention strategies may be less than optimal in changing risky behaviors in such situations as those of commercial sex workers (Bandura, 1982(Bandura, , 1987Ford et al., 1996;O'Leary & Martins, 2000;Pleck, Sonenstein, & Ku, 1990). Social-structural factors, such as extreme poverty, which characterizes Filipino FCSWs, and a lack of support by employers as well as customers may impede safe sex practices; satisfying the customer's desire for sex without a condom may have become almost mandatory in maintaining one's livelihood and reducing conflicts with employers, despite the FCSW's personal perception of risk. Peers may also exert an influence on safe sex behaviors when FCSWs are based within establishments. Therefore, economic factors, peer influences, and employment-or employerrelated factors may have become a major barrier against consistent condom use ( Morisky et al., 1998;Outwater et al., 2000).In contrast, a perception of a supportive attitude by one's employer toward cond...