Objective: Clinical phenomena often feature skewed distributions with an overabundance of zeros. Unfortunately, empirical methods for dealing with this violation of distributional assumptions underlying regression are typically discussed in statistical journals with limited translation to applied researchers. Therefore, this investigation compared statistical approaches for addressing highly skewed data as applied to the evaluation of relations between child maltreatment and non-suicidal self-injury (NSSI). Method: College students (N = 2,651; 64.2% female; 85.2% nonwhite) completed the Child Abuse and Trauma Scale and the Functional Assessment of Self-Mutilation. Statistical models were applied to cross-sectional data to provide illustrative comparisons across predictions to a) raw, highly skewed NSSI outcomes, b) natural log, square-root, and inverse NSSI transformations to reduce skew, c) zero-inflated Poisson (ZIP) and negativebinomial zero-inflated (NBZI) regression models to account for both disproportionate zeros and skewness in the NSSI data, and d) the skew-t distribution to model NSSI skewness. Results: Child maltreatment was significantly and positively related to NSSI frequency in the raw, transformation, and zero-inflated models, but this relation was negative in the skew-t model. Conclusions: These findings highlight the importance of using zero-inflated models rather than transformation approaches to address data skew. Moreover, whereas the skew-t distribution has been used to model skewed non-clinical data, this study suggests that the skew-t approach may not be well-suited to address skewed clinical data.

Objective This study examined early childhood paternal incarceration (PI; birth to Age 6) effects on children's elementary reading achievement (i.e., Ages 8–10) as mediated by mothers' supportive caregiving and moderated by child gender. Background Extant research on PI has primarily focused on child behavioral problems. However, less is known about specific relations between PI and academic achievement. Method Participants were drawn from an ongoing, longitudinal study of development using a subsample of 180 children and their maternal caregivers (51.5% female children; 48.9% Latinx; 26.7% experienced PI). Study variables were assessed using semi‐structured incarceration interviews, observational parenting tasks, and standardized achievement tests. A moderated mediation analysis evaluated the hypothesized model by child gender. Results PI predicted decreased maternal supportive caregiving, which, in turn, predicted lower reading achievement, even when family socioeconomic status, child ethnicity‐race, prior supportive caregiving, prior reading achievement, and maternal psychopathology were held constant. Further, a moderation analysis indicated that the relation between maternal supportive caregiving and reading achievement was moderated by child gender. Conclusion This investigation revealed a significant and negative indirect effect of early childhood PI on children's reading achievement via changes in maternal supportive caregiving. However, this indirect effect was significant for boys only. Implications These findings highlight the potential for interventions and resources that promote supportive maternal caregiving to mitigate the deleterious effects of PI on children's reading achievement, especially for boys.

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