Modeling (in)congruence between dependent variables: The directional and nondirectional difference (DNDD) framework.

This article proposes a new approach to modeling the antecedents of incongruence between 2 dependent variables. In this approach, incongruence is decomposed into 2 orthogonal components representing directional and nondirectional difference (DNDD). Nondirectional difference is further divided into components representing shared and unique variability.

Perceived deterrents to being a plasmapheresis donor in a voluntary, nonremunerated environment.

Background: As demand for plasma-derived products increases internationally, maintaining a committed plasmapheresis panel membership is critical for blood collection agencies. This study addresses the current lack of knowledge regarding deterrents to the recruitment and retention of plasmapheresis donors in a voluntary nonremunerated environment.

Study Design And Methods: Nine focus groups (n = 84) and six individual interviews were conducted using semistructured schedules.

Predicting the retention of first-time donors using an extended Theory of Planned Behavior.

Background: Donor retention is vital to blood collection agencies. Past research has highlighted the importance of early career behavior for long-term donor retention, yet research investigating the determinants of early donor behavior is scarce. Using an extended Theory of Planned Behavior (TPB), this study sought to identify the predictors of first-time blood donors' early career retention.

Donating blood: a meta-analytic review of self-reported motivators and deterrents.

Although research on blood donor motivation abounds, most studies have typically focused on small sets of variables, used different terminology to label equivalent constructs, and have not attempted to generalize findings beyond their individual settings. The current study sought to synthesize past findings into a unified taxonomy of blood donation drivers and deterrents and to estimate the prevalence of each factor across the worldwide population of donors and eligible nondonors. Primary studies were collected, and cross-validated categories of donation motivators and deterrents were developed.