Add Health is a school-based longitudinal survey of US adolescents enrolled in grades 7 through 12 in the — school year. The core, nationally representative, sample of respondents was drawn from 80 high schools stratified by region, urbanicity, size, type, and ethnic composition. For schools not containing grades 7 through 12, a feeder middle school was also sampled, bringing the total number of schools to The questionnaire included basic demographic information and several health-related questions, including alcohol consumption.
Important for our peer network hypotheses, the in-school survey also asked students to identify up to five male and five female friends from school rosters. These nominations allow for the construction of peer behavior and social status measures that are collected directly from peer reports and thus avoid projection bias resulting from self-reported peer characteristics Haynie All students who completed an in-school questionnaire, or who were listed on the school enrollment roster, were eligible for the first in-home survey administered around six months after the in-school survey. Between December and April of , students were interviewed in their homes for 1—2 hours.
Less sensitive questions were asked aloud by interviewers, with answers recorded on laptop computers. More sensitive questions, including the alcohol items, were pre-recorded as audio files so that respondents listened via headphones and responded directly on the computer. The second in-home survey was administered about one year after the first in-home survey, between April and August of The format and items included in the wave 2 survey replicated or added to the wave 1 survey.
Except for graduating seniors and respondents in the wave 1 disabled sample, all students who completed the first in-home interview were eligible for a second in-home questionnaire, totaling 14, respondents. The time-reference for the wave 2 romantic relationship questions covered relationships occurring in the 18 months prior to the survey.
This limits any overlap between the questions asked in the in-school and wave 2 surveys and maintains the correct temporal ordering of our concepts. Of the 14, wave 2 respondents, 4, students nominated at least one romantic partner identifiable on a school roster, resulting in 5, romantic dyads. Of these, couples had partners who both completed the in-school and wave 2 surveys and were part of the nationally representative sample.
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Removing one of the duplicate dyads resulted in unique pairs. To remove unobserved between-couple correlations, we selected only one couple per student. Where possible, reciprocated couples were retained in the sample there were five instances where respondents were in more than one reciprocated couple. For unreciprocated dyads, the first i. In cases where a partner was nominated by more than one respondent and the relationship orders were identical, one of the couples was retained at random.
Dangerous Liaisons? Dating and Drinking Diffusion in Adolescent Peer Networks
This resulted in the loss of an additional 14 couples. The final sample consisted of couples reciprocated and respondents embedded in 93 secondary schools. Table 1 lists descriptions and descriptive statistics, by gender, for our dependent and independent variables. The weights adjust variable means for clustering and unequal probability of sample selection. At the couple-level, weights were computed as the inverse of the joint selection probability of partners in each pair Chantala This procedure created several extreme outliers that potentially inflate variance components and bias parameter estimates.
For individual-level variables, we provide p-values for a Wald chi-square test of gender mean differences. In addition, there was a significant gender difference, with males being more likely than females to report binge drinking. Although male daters reported higher drinking frequencies than female daters, the difference in means was not statistically significant.
All of these variables are based on an item of problem drinking asked in the in-school survey: The latter are likely to suffer from projection bias and overestimate peer effects Jussim and Osgood Values of zero were entered for 10 sampled respondents with no friendship ties.
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Finally, we create a measure for friends-of-partner gender composition as a potential mediator of the relationship between friends-of-partner drinking and our outcomes. We introduce several control variables that may confound the relationships between our primary predictor variables i. All of these variables are constructed from the in-school survey. Non-Hispanic white is the omitted reference category. Note, however, that due to the requirement that both partners be part of the Wave 2 survey, the between-partner age spans are censored at both ends, meaning that much older or younger partners are excluded from our couple sample.
We include two family background variables. Intact family is an indicator for respondents living with both of their biological parents. Parent s education captures the highest level of education reached by either parent, where 0 is less than 8 th grade education and 5 is post-graduate schooling. Athlete identifies students reporting past or anticipated involvement in at least one of twelve school sports.
Club identifies students reporting past or anticipated involvement in at least one of sixteen non-athletic extracurricular clubs or organizations e. Friend involvement is the average proportion of friends up to 5 male and 5 female with whom the respondent reported doing a list of five activities within the past week see also Payne and Cornwell We introduce two couple-level variables potentially related to our outcomes and primary independent variables. As can be seen in Table 1 , just over one quarter of dyads had reciprocated romantic nominations.
Relationship duration captures the self-reported length of the relationship, measured in years. Finally, we introduce several school-level covariates to explain potential between-school variation in our drinking outcomes. All of these variables were created by Add Health administrators based on the school sample at the time of the in-school survey. Size is a 4-point ordinal measure capturing the number of enrolled students in the school. Proportion white represents the proportion of enrolled students who identify as non-Hispanic white.
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Region indicates whether the school is in the Western reference category , Midwestern, Eastern, or Southern region of the United States. Private indicates a school is either religiously affiliated or non-religious private. We imputed missing values into five complete datasets. To allow for the correlation between partners on observed characteristics, we kept the partners and respondents on the same data row during the imputation procedure. Following imputation, partners were placed in separate rows at the individual level to allow for hierarchical analysis see below.
Our research questions focus on influence processes within heterosexual romantic dyads. Estimating actor and partner effects requires us to treat within-dyad outcomes as dependent observations i.
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When the assumption of independence is violated, standard errors are biased and coefficient estimates are inefficient. The Actor-Partner Interdependent Model APIM takes the dyad as the unit of analysis and allows for the simultaneous estimation of actor and partner effects while adjusting for the non-independence of dyadic data Kenny, Kashy, and Cook We also introduce a third level to the model capturing the clustering of couples within schools and add several variables that may explain variation at that level. Using standard multi-level notation, the level-one APIM equation with one actor effect and one partner effect is:.
The level-two equations are:.
The random component captures between-couple variation in the outcome, net of other model covariates. Similarly, the level-three equations include a fixed and random component for the school-level intercept:. In the unconditional model, the random intercept components are used to calculate the intraclass correlation coefficients at levels two and three, which in our case are the proportions of the outcome variance that lie at the couple and school levels.
An important concept for APIM models is whether partners are distinguishable on an observed characteristic. In our study of heterosexual couples, gender uniquely distinguishes one partner from the other. Including in our models an indicator for gender and interactions between gender and other covariates allows us to examine if outcome means and actor or partner effects vary between boys and girls. Both of our outcome variables are non-linear and violate normality assumptions, prompting us to estimate hierarchical generalized linear models HGLM.
Our first outcome is a binary measure of binge drinking. We predict this outcome with hierarchical logistic regression models with Bernoulli sampling and logit link functions. As in the case of single-level logistic regression estimation, coefficients can be interpreted as odds ratios and predicted probabilities can be plotted for selected values of primary independent variables.
To predict this outcome for partners nested in romantic dyads and schools, we estimate three-level hierarchical ordinal regression models with multinomial level-one sampling and cumulative logit link functions. Estimates from these models can be interpreted as odds ratios for cumulative probabilities. This version of the HLM statistical software allows for model estimation using multiply-imputed datasets and the inclusion of sampling weights at multiple levels of analysis.
All covariates are grand mean centered. Our analyses proceed in three steps.