The outcomes were measured with composite variables computed as a mean of at least two scales. (crimesolutions.gov)
This composite variable is comprised of parent / guardian's» education, occupation, and income. (commons.trincoll.edu)
In addition, given the significant correlations between mother and father reports (DAS r = 0.60, p =.000 for CG, r = 0.47, p =.000 for SB group), parent reports were combined to create a composite variable, which yielded adequate reliability (α =.92 for SB; α =.72 for CG). (academic.oup.com)