Source: Data from Tarlov, A. R., J. E. Ware, Jr., S. Greenfield, E. C. Nelson, E. Perrin, and M. Zubkoff. 1989. The medical outcomes study.  An application of methods for monitoring the results of medical care. Journal of the American Medical Association 262: 925-930. https://doi.org/10.1001/jama.1989.03430070073033.
Data on health insurance available to 644 psychologically depressed subjects.