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Social Network Effects on the Transmission of Sexually Transmitted Diseases



Background Only a limited number of studies have examined the effects of social networks on sexually transmitted diseases (STDs), although the findings of such studies would be helpful in designing more effective prevention strategies.

Goal This study attempts (1) to determine whether there are any social network effects on STD transmission after controlling for other risk factors and (2) to explore the possible mechanisms by which social networks exert their effects.

Study Design Logistic regressions examine the effects of friendship networks on STD transmission using data drawn from the Chicago Health and Social Life Survey (CHSLS). Additional logistic regressions probe the possible mechanisms (social control versus information and dyadic versus third party) that account for how the observed effects of networks might arise.

Results and Conclusion Among people who had fewer than 13 lifetime sex partners, those with no social friends were only 0.4 times as likely to be infected as those with one or more social friends. Among people who had 13 or more lifetime partners, those with many friends (5 or 6) but weak ties to them (talking less than once a day with them) were only 0.2 times as likely to be infected as those with either fewer friends or stronger ties to their friends. Additional regressions suggest that network effects resting on dyadic control prevail among those with fewer than 13 lifetime sex partners. In contrast, network effects resting on information exchange among third parties prevail among those with 13 or more lifetime partners.

Using data from a representative sample survey in Chicago in 1995 (the 890 interviewees were predominantly white and female with a mean age of 36.8 years) this study finds that social networks exert effects on the relative likelihood of having ever had a sexually transmitted disease, even after controlling for other individual risk factors.

From the *Department of Sociology, University of Illinois at Chicago, and †University of Chicago, Chicago, Illinois

The authors thank Patrick Heuveline, Sevgi O. Aral, and other participants at the International Sunbelt Social Network Conference, held in Budapest, Hungary, in April 2001, for their helpful comments and suggestions.

Supported by the Ford Foundation (grant no. 940-1417-2) and the National Institute for Child Health and Human Development (5 RO1 HD28356-03).

Reprint requests: Yoosik Youm, PhD, Sociology Department (m/c 312), University of Illinois at Chicago, 1007 West Harrison Street, Chicago, IL 60607. E-mail:

Received for publication November 15, 2001,

revised January 23, 2002, and accepted January 25, 2002.

SEXUALLY TRANSMITTED DISEASES (STDs) are a serious social problem in the United States. Rates of curable STDs are the highest in the industrialized world and are even higher than those in some developing regions. 1 Half of the most commonly reported infections in the United States are STDs, 2 and STDs accounted for 87% of the reported cases of the 10 leading notifiable diseases in 1995. 3 The Centers for Disease Control and Prevention estimated 15.3 million new cases in 1996, 4 and the annual costs of selected major STDs, excluding HIV infections, are estimated to be $10 billion. 5 In addition, various STDs may lead to cancer, infertility, ectopic pregnancy, spontaneous abortion, stillbirth, and low birth weight for infants and increased risk for acquiring HIV. 6

Historically, the main focus of STD epidemiology has been on the attributes and behaviors of individuals, this being consistent with the dominant perspectives in clinical medicine, chronic disease epidemiology, and psychology. 1 Since the late 1980s, however, many researchers have recognized the important role of sexual networks in sustaining the extraordinarily high infection rates in the United States. Unlike chronic diseases, the odds of being infected (and also infecting others) are determined by factors above the level of the individual: they depend not only on the individual person's risk factors but also on that person's sex partners’ risk factors. Thus, sexual network effects on the dynamics of STDs have steadily gained research attention. 7–16 In sharp contrast to the increasing attention devoted to sexual networks, research on social network effects on STD transmission has rarely been emphasized, and empirical research is limited due to the lack of pertinent data in the United States, with a few notable exceptions. 17–19 In Europe, although some research, based on the pooling of 16 population surveys across 11 countries undertaken by the European Concerted Action on Sexual Behavior and Risks of HIV Infection program, 20,21 has succeeded in revealing that social factors (or social relationships) are critical to the spread of HIV, most research has focused on social relationship in general instead of probing the specific features of social networks that mediate these effects.

Without paying close attention to social factors (or social networks in particular), research on the spread of STDs is necessarily incomplete because risk factors are socially constructed, as confirmed in many European research studies. 22–24 Although sex has a biologic underpinning, sexual behavior is one of the most socially diverse human activities. As a direct result of this fact, risk factors regarding sexual behaviors are rooted in and consistently affected by social environments around them. For example, the same person bears quite different levels of risks or different odds of changing sexual behavior, depending on whether the sexual relationship is defined in his or her social milieu as short-term and casual or regular and ongoing, voluntary or forced, or supported or unsupported by the couple's social peers.

Research on the effects of social networks is vital for establishing effective primary prevention—intervention that prevents infection from occurring in the first place. Improved diagnostic tests for STDs have recently revealed that asymptomatic infections are much more prevalent than symptomatic diseases 25 and that most STDs do not result from contact with clinically apparent diseases but rather with unnoticed and frequently subclinical infections. 26 Given this situation, primary prevention is crucial for curbing STDs. 5 However, reaching a targeted population for primary prevention (persons who are at risk but not yet infected) with the necessary information about avoiding STDs is not straightforward because most people do not get their information about STDs from the media. Instead, people primarily obtain and transmit information about STDs through their informal social networks, especially their friends. Analysis of the National Health and Social Life Survey, based on a nationally representative sample, found that about 40% of the adult population primarily relied on close, informal, non-kin networks (friends or sex partners) for learning about sexual matters when they were growing up, while only 8% primarily relied on school instruction (and only 1% on TV or medical clinics). 27

Using data from the Chicago Health and Social Life Survey (CHSLS), including information about both sexual partnerships and social relationships, this study attempted (1) to determine whether there are any social network effects on STD transmission after controlling for other risk factors and (2) to explore the possible mechanisms by which social networks exert their effects.

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The CHSLS provides a rare opportunity to explore these issues. While the CHSLS is a large project that includes multiple surveys of a cross-section of Cook County residents, residents of four selected neighborhoods in the city, and an extensive ethnographic component, we used in this analysis data from only a representative sample of 890 Cook County residents, collected in 1995 in face-to-face interviews averaging 90 minutes in duration. We asked respondents to enumerate up to six of their friends, including up to three free-time partners (adults with whom the respondent spent time for his/her enjoyment after work or school or on the weekend) and up to three discussion partners (adults with whom the respondent most often discussed important matters). Respondents were asked to exclude their sex partners when they enumerated friends. There were also questions about the respondents’ sex partners as well as various sexual behaviors, including number of sex partners and history of STDs.

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Control versus information.

Social networks can change STD transmission dynamics through their effects on (1) the social control exercised by social network members over the focal individual's choice of sex partner(s) and behavior and (2) the flow of pertinent information about the risks posed by particular sex partners, behaviors, and meeting places such as local bars. Both control and information can work thorough either dyadic ties or third parties. Let us elaborate on these alternative pathways of social influence. 28 First, people's sexual behaviors are shaped and controlled by various stakeholders in the sexual relationship. 27 Social control or influence over one another's behavior can be exerted directly by the two immediate stakeholders themselves, i.e., the sex partners in the dyadic relationship itself, or via third parties, such as parents or friends, who constitute the individual's informal social network. The stronger the control exerted through either the dyadic relationship itself or third parties (such as parents) with stakes in the maintenance of that particular relationship, the less likely the partnership will involve risky behavior (especially a high turnover of partners).

Strong social control from social peers such as friends or neighbors, however, can have the opposite effect. If a young man is tightly embedded in a circle of young men who regard having large numbers of sex partners as normal and even desirable for enhancing one's social standing (i.e., reputation) in the group, he is likely to have a higher turnover of partners than he would have otherwise. On the one hand, being strongly tied to parents or to the dyadic relationship with one's current sex partner (i.e., being strongly embedded in these relationships) decreases risky behavior in general. On the other hand, being strongly embedded in a peer group can have either positive or negative effects on risky behavior, depending on the characteristics of the peer group.

Turning to a consideration of the second mechanism, we observe that people typically obtain and transmit pertinent sexual information through their social networks. 29 From general knowledge about safe sex or techniques to avoid STDs to specific information about locales that are likely to have safe casual sex partners, people heavily rely on their informal social networks because such information is more likely to be available, credible, trustworthy, timely, and specific in such networks. For example, in Bangladesh, a social network approach that utilized local influential persons was five times more efficient in transmitting modern contraceptive practices than a traditional approach that sent field workers on home visits. 30 The media are poor sources for such information because they are overly generalized (or lacking in specificity), lagging in timeliness, trustworthiness, and reliability in their availability—in short, they lack credibility and immediacy of access to locally relevant information. People with timely, accurate information are less likely to acquire STDs. Although sexual information, in principle, can flow through either third parties or the dyadic relationship itself, we believe that most (especially information regarding potential new sex partners) flows mainly through third-party connections and not through the dyadic sexual tie itself. Needless to say, third-party mechanisms and dyadic mechanisms are interacting in many ways. For example, strong support from the third party can increase self-esteem or bargaining power in dyadic control. We do not attempt to analyze this interaction effect separately because of the small number of cases available.

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Friendship networks.

We differentiate social friendship networks on the two dimensions of range and cohesion in order to distinguish the network mechanisms of information and control. We treated “five or six friends” as a large friendship circle (and “fewer than five” as small), and we assumed that if people talk to their friends every day on average, they have a strong friendship network (while a weak network involves friends with whom the respondent talks less frequently than once a day). Note that “strong friendship” means intense dyadic ties between ego and friends, not necessarily strong or tight embeddedness of a relationship through a third party as discussed above. Somebody can have a strong friendship while his or her sexual relationship is weakly embedded within each partner's kin networks. Four types of friendship circle are distinguished: no friends, strong and small friendship circles, weak and large circles, and a combination of strong and large circles and weak and small circles (the final categorization was made after evaluating various cut-off points such as “three or more friends” for large friendship or “several calls a week” for strong friendship).

In general, strong and intensive ties are believed to produce greater mutual commitment and social control, while weak ties provide more information than control. 31,32 Also, many social ties will lead to the provision of more information than fewer ties. Few and strong ties are more likely to produce social control and influence, while weak and many ties are more likely to be sources of nonredundant and thus useful information from the multiplicity of ties. Thus, in friendship networks as well, we can assume this general property of social networks. The category of “no friend” will manifest strong dyadic control (only the sex partner is present to exercise control) without third-party integration (no extrarelational ties exist). A “strong and small friendship circle” implies strong control through third parties (friends) in a small clique who can communicate with one another about the matters at hand, and a “large and weak friendship circle” is likely to produce large information flows among the participants (friends) who do not belong to the same small clique and thus have access to different sources of information. Other intermediate types, such as the “strong and large circle” or the “weak and small circle,” are not easy to interpret because we cannot specify a priori whether the control or information effect is dominant without more detailed information about the social networks around the respondent.

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Dyadic control/information.

As discussed above, social networks exert social control or influence and disseminate information in two ways: through the sexual dyad itself and through third parties. Dyadic control will be measured by four variables: (1) the amount of free time spent with the most recent partner, (2) conflict with the most recent partner arising from sexual jealousy, (3) ever having forced sex (forced or being forced), and (4) easiness of discussing sexual topics with the most recent partner. We assumed that spending free time with one's sex partner provides more opportunities to exert influence over one another as well as to index tighter control over one another. We use the incidence of jealous conflict to index the failure of strong dyadic control. Also, if sex was forced, it is apparent that there is a considerable disparity in power between the partners. Unlike the other forms of dyadic control, this expression of strong control over a victimized partner, we believe, will have a positive effect on the probability of having been infected because of the intrinsic nature of forced sex. Effective negotiations on safe sexual activities during intercourse (for example, condom use) might simply be impossible under these circumstances. We also assume that the uneasiness of talking about sexual topics with the partner can be a proxy measure for the power relationship between the partners 33: a very unequal relationship does not allow sexual topics to be discussed. Although we do not anticipate that information exchange about STD risk factors is especially likely to occur within the dyad itself, “shared free time” and “easy talk about sexual topics” can be related with diffusion of information within the partnership. The easier it is to talk about sexual topics and the more people share their free time, the greater the information flow is likely to be.

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Third-party control/information.

Limitations in the availability of pertinent data in the survey make it much more difficult to distinguish between control and information effects due to third-party embeddedness. In our previous example regarding the young men tightly embedded in a social circle of very sexually active men, it is highly probable that his peers exert a powerful social influence over him and, at the same time, that they provide him with useful information about the potential risks of his sexual activities. When sex partners who have many mutual acquaintances begin their sexual relationship, it is likely that the mutual acquaintances, as stakeholders, will work both as information providers about the partners’ respective strengths and weaknesses and as an influence in persuading them that they are a good (or bad) match, thus affecting the duration of the relationship. 34–36 As an indicator of third-party influence (without being able to distinguish between the effects of control and information), we used “number of mutual acquaintances when the respondent met his/her most recent partner” and “acquaintance with more than half of the current neighbors who live in the same building or on the same street.” One kind of third-party control, however, is explicitly measured, namely, the most recent partner's acquaintance with the respondent's parents. If the partner knows both parents of the respondent, we assume that the couple is strongly integrated in an overlapping kinship network and thus risky behavior is decreased through the mechanism of social control (rather than information exchange).

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Logistic regressions.

Below we present two sets of regressions in order to answer two questions: (1) can we observe effects of friendship networks on the likelihood of having ever been infected with an STD, even after controlling for other risk factors? and (2) can we demonstrate that social network effects operate through two distinct mechanisms, either dyadic control/information or third-party control/information? Preliminary log-linear results suggested that we should divide the sample into two subgroups because there is strong evidence that social networks work on the likelihood of ever having been infected with STDs in opposed directions, depending on whether a respondent has had many lifetime sex partners (13 or more) or relatively few. (Cut-off points other than “13 or more” were tested by log-linear analysis to determine which one best captured the nonlinear effect.) Thus, all the logistic regressions are examined separately for these two subgroups.

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Dependent variable.

The dependent variable, “ever infected with any STDs during lifetime,” is measured on the basis of the following survey passage: “There are several diseases or infections that can be transmitted during sex. These are sometimes called venereal diseases, or VD. We will be using the term sexually transmitted diseases, or STDs, to refer to them.” After giving the respondent a card listing each STD (sometimes including their vernacular terms, for example, “clap” or “drip” for gonorrhea), the interviewer asked: “As I read each STD, tell me whether you have ever been told by a doctor that you had it.” A distinction was drawn only between ever infected and never infected: we did not distinguish people who were infected only once from people who were infected several times.

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Control variables.

Demographic attributes, including age, gender, marital status, racial/ethnic groups, and educational level, are included in the logistic regressions as control variables. Other control variables measuring the respondent's other risk factors for STDs include ever experiencing same-gender sex, ever having injected nonprescribed drugs, number of lifetime sex partners, and having a concurrent partnership during the most recent sexual partnership.

Please note that although the partner-related network variables all refer to the most recent sex partners and both the neighborhood-related and friend-related variables are also current (they refer to current neighbors or current friends), the dependent variable refers to lifetime experiences with STDs. This undesirable reversal in the time order of the dependent and independent variables was necessitated because the current (or last year's) STD prevalence is too low (only 1.9%) to sustain statistical analysis. (In contrast, the lifetime prevalence is 19%, providing a much more substantial case base to sustain analysis.) This important limitation will be examined in detail in the discussion section later. All the variables in the logistic regression are summarized in Table 1.



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Existence of Friendship Network Effect

Table 2 reveals not only that friendship networks do have effects on the transmission of STDs, even after controlling for other risk factors, but also that friendship networks have different effects, depending on the number of sex partners the respondent has.



The first logistic regression was for people with few lifetime sex partners (1 to 12 partners) and the second logistic regression was for those with many lifetime sex partners (more than 12). Among the people with few lifetime partners, those with no close social friends were only 0.4 times as likely to be infected as people with one or more social friends. Among people who had many lifetime sex partners, those with many friends but weak ties to them were only 0.2 times as likely to be infected as those with either fewer friends or stronger ties to their friends.

Consistent with previous research, both regressions show that women in general and black men and women in particular are much more likely to have had an STD sometime during their lifetime. Concurrent partnership during the most recent partners has opposite effects, depending on the number of lifetime sex partners the respondent has had. Concurrency increases the odds of having been infected for those with few lifetime partners but decreases the odds for those with many lifetime partners. This is an unexpected finding and will be discussed in the discussion section below.

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Social Network Effects

In order to probe mechanisms producing the effects of social networks on the differential likelihood of having had STDs, we ran an additional logistic regression for each of the two subgroups defined on the number of lifetime sex partners. Table 3 summarizes these two logistic regressions.



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People with few lifetime partners.

Four variables pertaining to dyadic control/information were added to examine its effect. Two seem to be very effective: when persons report jealous conflict in their relationship, which, we assume, implies a failure of strong dyadic control, they are almost twice as likely to be infected. Having forced sex (the respondent either forced or was forced) increases the odds of being infected about three times. A serious power discrepancy between partners, and thus serious difficulty in negotiating for safe sex practices, increases the odds of being infected. Spending more free time with the partner and easy discussion of sexual topics, however, do not seem to be effective in avoiding STDs.

The effects of third-party control/information exchange were examined by three variables. Only integration with the parents is significant: persons whose most recent partner knows both their parents are only 0.6 as likely to be infected. This is regarded as third-party control rather than third-party information because parents rarely give sexual information to their adult children. “Having many mutual acquaintances” or “acquaintance with more than half of neighbors,” however, does not exert significant effects.

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People with many sex partners.

Neither of the dyadic mechanisms (control and information exchange) is operative among people with many lifetime sex partners. Among the third-party control/information mechanisms, “acquaintance with more than half of the neighbors” is very effective in avoiding STDs. People who knew more than half of their neighbors who live in the same building or on the same street are only 0.2 as likely to be infected.

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Although the CHSLS is rare in having a representative data set that contains such a comprehensive inventory of both a person's sex life and social network information, our models all suffer from a fundamental inconsistency in the time order between the dependent variable (which refers to the acquisition of STDs over the adult lifetime) and some of the independent variables that refer only to a narrowly defined, recent period. It is thus even possible that in our regressions, part of the causation may occur in the opposite direction: experience of STD infection caused subsequent change in the informal social networks. This can be possible especially if the infection was very serious, such as HIV/AIDS that has extremely low prevalence.

However, we contend that this reversal of the time order is not fatal to our purposes because individuals’ patterns of organizing their informal social ties tend to be relatively stable over the life course, 37–40 especially once demographic characteristics such as gender, age, education, and especially marital status are controlled. 41–44 In short, the measure of the respondent's current social network can be regarded as a proxy measure of the adult respondent's lifetime structure of informal social ties. In a study of the friendship ties of 1013 white men living in Detroit, for example, Laumann 37 found that the men characterized themselves as either “having just one or two really close friends” or “having a large number of people they felt really close and friendly with” and that whether they had few or many friends was associated with a basic personality need for affiliation as well as the actual number of friends they presently had. There is also an extensive literature in social psychology that links various measures of extraversion and sociability with actual patterns of socializing with others that strongly imply stability in the structuring of a person's social network about size and density over his/her adult life course, especially in the research on attachment styles. 45–51

Even though we firmly believe that an individual's informal social network pattern tends to be stable over time, reflecting his or her level of social competence, social position, and capacity to sustain ties with others, and thus that the current network may be treated as a proxy for the past, only future data that provide longitudinal network information as well as time-ordered information about sexual activities can provide a definitive test of our hypotheses. Fully acknowledging this limitation in our data, we believe that the CHSLS provides highly suggestive evidence of the strong and consistent effects of informal social networks on STD transmission dynamics.

In Table 2, “concurrent partnership” decreases the odds of being infected among people with many sex partners, which is counterintuitive and requires discussion (even though it loses most of its statistical significance once we control for other network-related variables in Table 3). Instead of making a specific argument here, we would like to suggest a hypothesis for future research because this is an unexpected and potentially important finding that requires testing with regression models and data more appropriately designed for the purpose. Let's assume there is a person who had many sex partners in a given period (for example, 5 partners last year). With high partner turnover in a given period, overlap between partners is more likely to happen than when a person has only a few partners in the same period. Thus, if someone has many sex partners but with no overlap, each partnership is likely to be short and thus casual, approximating one-night stands between strangers with all the risk that entails. In this sense, concurrency may imply longer and thus less risky relationships for people with many sex partners. This reasoning cannot apply to people with few sex partners because they are likely to have long, stable partnerships even without overlap, approximating serial monogamy.

We have found that there is indeed an important effect of friendship networks on the likelihood of having had STDs, even after controlling for other risk factors. Furthermore, depending on the number of lifetime sex partners, different friendship patterns exert different effects. Among the people with few lifetime sex partners (up to 12 partners), having no friend is effective in avoiding STDs, while having many friends with weak ties is helpful among the people with many lifetime sex partners. We speculate that people who are socially isolated (lacking any current friends) are likely to focus their energy and social resources on their sex partners, and thus when they secure them, it results in strong mutual control and influence over one another. This reduces the risk factors to the sex partners and results in lowering the odds of being infected over the lifetime. Also the fact that only a “weakly tied, large friendship network” confers a preventive advantage among the people who have many lifetime sex partners hints that information (rather than control) is the critical factor; thus, third-party information is especially essential for avoiding STDs for people with high partner turnover.

Persons with many sex partners find it difficult, even should they want to, to exert strong dyadic control over each of their numerous partners because of two considerations. First, they simply do not have sufficient time, resources, and energy to exercise strong control over each partner. Second, they suffer a loss of legitimacy in making claims for sexual exclusivity when they themselves do not provide it to any of their partners. Instead, they must rely on third-party embeddedness to mitigate risks. This finding leads us to conclude that the people in real danger are those who not only have many sex partners but also have only a small number of friends with whom they have strong ties (in short, they constitute one small clique).

These accounts gain further support in the results obtained in the logistic regressions reported in Table 3. Among the people with few lifetime sex partners, dyadic control is especially effective: control or power within dyadic relationship is very effective (measured by “jealous conflict” or “forced sex”). Parental control (measured by both parents knowing the most recent partner) is also helpful in avoiding STDs. In sharp contrast to the prevalence of dyadic control among the people with few lifetime partners, no dyadic control or dyadic information exchange is effective among the people with many lifetime sex partners. Only acquaintance with the current neighbors is important. Knowing many neighbors may provide critical information about potential partners or a good place to meet safe partners. Also neighbors may work as stakeholders in encouraging stable and norm-complying relationships, even though we believe this is not as important as information exchange for the people who have many sex partners.

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