Measurement of social capital among clinical research trainees.

While physical and human capital are established as important predictors of success among early-career clinical investigators, less is known about the role of social capital. The authors aimed to develop a brief scale to assess social capital in this population and test its reliability and validity. A three-item assessment was developed based on a conceptual framework and measures of social capital from other fields and was administered to 414 clinical research trainees at the University of Pittsburgh in 2007-2012. The measure exhibited good internal consistency reliability (α = 0.71) and a normal distribution. On a 10-point scale, mean social capital was 6.4 (SD = 1.7). Social capital was significantly associated with 7 of the 9 expected constructs: sex, age, confidence in research skills, work-related motivation, burnout, and social support. Exploratory multivariable regression analysis demonstrated that social capital was most strongly associated with higher research confidence (β = 0.35, p < 0.001), higher extrinsic motivation (β = 0.50, p = 0.003), and lower burnout (ptrend = 0.02). This three-item scale measures social capital in this population with adequate internal consistency reliability, face validity, and construct validity. This brief assessment provides a tool that may be valuable to benchmark social capital of clinical research trainees and to better contextualize programmatic and trainee outcomes.