Examining food intake similarities in adolescent best friend dyads using longitudinal Actor-Partner Interdependence Models

Included in this collection are the following files: - The final paper: “van den Broek et al. 2022 - Final APIM paper Appetite.pdf” - Four data files: The dyadic datafile “W1W2_analytic_sample_inclnothome.sav” includes both the new and enduring dyads combined. Of this dataset, there is also a pairwise dataset "W1W2_questionnaire_children_merged_completedyadsonly_inclnothome.sav”, where dyads are represented seperately, in two rows, which was used to detect multivariate outliers. Additionally, in two separate datafiles, the enduring and new dyads were included separately (“W1W2_analytic_sample_enduring_inclnothome.sav” and "W1W2_analytic_sample_new_inclnothome.sav”). All datafiles included both the total food intake scores and the intake of food that is obtained from outside the home (“nothome”). - Analytic code: “R_Code_APIMs_NvdBroek.R” - Materials: The codebook for the measures used in this paper can be found on https://osf.io/bysgq/ - Pre-registration: The pre-registration for this paper can be found on https://doi.org/10.17605/OSF.IO/8T95Y Abstract: Little is known about how adolescent best friends may affect each other's food intake. This study explored whether friendship selection and socialization mechanisms explained potential food intake similarities in adolescent reciprocated best friend dyads. We also tested whether socialization processes were moderated by dyad member's relative zBMI. Members of 145 same-gender best friendship dyads (56% female; Mage = 12.79; SDage = 0.61) reported on their intake of food obtained from home and from outside the home at the beginning and the end of the school year through food frequency questionnaires. Longitudinal Actor-Partner Interdependence Models results showed no indication of selection or socialization, and very limited evidence for the moderation of socialization processes by relative zBMI. These findings indicate that focusing on adolescent reciprocated best friends in dietary interventions may not be valuable.