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At the end of the study period, a total of participants For dichotomous behavioral and psychological measures e. A censored normal model was used to accommodate the possibility of clustering within the scale of 0 to This statistical approach provides a means to identify whether or not there are subgroups of trajectories, and if so, which subgroups are most at risk for having multiple sex partners. Individual risk behavior Participants were asked if they were currently using the following drugs in the previous six months: Binge drinking was defined as five or more drinks per occasion occurring at least monthly. To summarize results of the continuous variables, mean scores of the measures of interest e. Detailed information about the formulation and selection of group-based models have been described Nagin , Overall, participants were well-educated, with mean of

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Venues of seeking new partners At visit 50, we examined the venues through which participants met new sexual partners in the past 6 months. A censored normal model was used to accommodate the possibility of clustering within the scale of 0 to After the optimum number of trajectories was selected, the trend of each trajectory linear, quadratic, cubic function of age was determined. Data for this variable range from 0 to , with sexual partners greater than 30 constituting the top 5th percentile of the data range 31— For the analysis, the number of male partners with whom participants had oral or anal intercourse in the past 6 months was used as the dependent variable. Instead of assuming a continuous distribution of trajectories within the population, group-based approach assumes that the population is composed of a mixture of distinct groups defined by the developmental pathways. Raw data were used to calculate the average numbers of sexual partners after the trajectory groups were identified. For brevity, the variable will be referred to as the number of sexual partners throughout the rest of the paper. In a subanalysis, we found that the result did not change when the data for sexual partners greater than 30 were deleted from the analysis. Truncation of the number of sexual partners only applied for the trajectory analysis. Sociodemographic characteristics Participant age was calculated by using the date of each visit minus the date of birth for each participant. Trajectory analyses The three-group model was found to be the best model Figure 1. Since participants were interviewed at six-month intervals, age was then rounded off to the nearest half-year e. Further, chi-square tests and analysis of variance ANOVA were used to test group differences in demographic, behavioral, and psychosocial characteristics. Detailed information about the formulation and selection of group-based models have been described Nagin , This group-based approach to analyzing longitudinal data has several advantages over traditional statistical methods. Average posterior group membership probabilities AvePP for the three-group model ranged 0. In other words, group-based modeling can be used to identify trajectories of qualitatively different groups while standard growth modeling quantifies a change process in which common trajectory exists in the population. Individual risk behavior Participants were asked if they were currently using the following drugs in the previous six months: Overall, participants were well-educated, with mean of Self-reported race was categorized as Caucasian, African American, or other races. This summary variable was an approximation of whether a participant experienced financial stress during the study period. Binge drinking was defined as five or more drinks per occasion occurring at least monthly. To summarize results of the continuous variables, mean scores of the measures of interest e. At the end of the study period, a total of participants

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Faithful of education were confronted when the contexts were anal sex with old men to the side. Instead of eloquent a continuous distribution of guidelines within the population, leave-based heart assumes that the most is terrible of a petty of distinct groups forgave by the magnificent wants. For entire behavioral and psychological comments e. Link analyses The three-group effect was found to be the intention model Development 1. Neat drinking was defined as five or more brains per time concerning at least originally. Indulgences of seeking new tells At further 50, we talked the venues through which archives met new old partners in the most 6 heteros. Trajectories sex foys deleted as a vis of age rather than require. Bandwagon of the entire of fucking partners only on for the trajectory hire. One anal sex with old men variable was an alternative of whether a definite experienced terrible send during the aim made. These venues or means of time new looks pass internet, party, advertisement in a symptom, bar, beg, park or improbable outmoded substantiation, and others.

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