Changes in stone composition over two decades: evaluation of over 10,000 stone analyses.

To examine the changes in stone composition from 1990 to 2010. A retrospective review was performed of all renal and ureteral stones submitted from the state of Massachusetts to a single laboratory (Laboratory for Stone Research, Newton, MA) for the years 1990 and 2010. Stone composition was determined by infrared spectroscopy and/or polarizing microscopy.

A study of the test of supervisory skills.

In supervisory selection and development it is important to assess individuals' supervisory competencies. In a field study, the Test of Supervisory Skills was validated against a surrogate criterion of supervisory performance, based upon position classification and supervisory experience. Subjects (N=2406), workers and applicants of both sexes, were recruited from multiple sources, tested, and the data analyzed to evaluate the usefulness of the test in human resource management applications.

Gallstone detection at CT in vitro: effect of peak voltage setting.

This study was a retrospective single-institutional study approved by the Committee on Human Research and was HIPAA compliant. A waiver for informed consent was granted. The purpose of the study was to evaluate the effect of four peak voltage settings on the in vitro conspicuity of gallstones in an anthropomorphic phantom at computed tomography (CT).

A prescribed employee fitness program and job-related attitudes.

A prescribed physical fitness exercise program was initiated in a small furniture manufacturing plant. The present purpose was to investigate the effect of an intervention to change employees' attitudes and sense of well-being. The objective was to evaluate the changes in employees' attitudes (well-being) attributable to the exercise program.