Finally, we examined the potential moderators one by one in the current study because little is known about predictors and moderators of the PFI efficacy in the literature. In addition, power to detect moderation effects is well known to be low (McClelland & Judd, 1993; Sackett et al., 1986). Given that identifying different subgroups is critical for screening, triaging, and implementing cost-effective interventions for those students in need, the current study adopted an exploratory approach. With a larger scale study designed to test moderation effects, it would be preferable to examine potential moderators simultaneously to understand their unique contributions.
