The measurement properties of a newly developed instrument Mentor Self-Efficacy Scale were examined among 249 Big Brothers Big Sisters (BBBS) mentor child and parent triads. The unidimensional scale demonstrated acceptable reliability (α = 0.81) and convergent validity with mentor self-efficacy (MSE) correlating with mentor reported global (r = 0.28 p<0.001) and engagement (r = 0.44 p<0.001) mentoring relationship quality (MRQ). The scale also yielded acceptable predictive validity with MSE predicting mentor reported engagement MRQ (β = 0.28 p = 0.001). Results will contribute to future research using the scale to augment BBBS policies.
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