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Evaluation & the Health Professions
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Carry-Over of Medical Information System Influence to Control Patients

James L. Rogers

Department of Psychology, Wheaton College

Olga M. Haring

Department of Medicine and Department of Community Health and Preventative Medicine, Northwestern University Medical School

James F. Phifer

Department of Psychology, University of Louisville

Evaluations of medical information systems (MIS) often compare one or more dependent variables between experimental patients having the MIS available and control patients. Typically, physicians who are exposed to and therefore are potentially influenced by the MIS during visits with experimental patients also see control patients, thus possibly weakening the internal validity of subsequent comparisons between the MIS and the control conditions. The present study examines the possible bias due to carry-over of MIS influence to control patients in the context of a prospective, randomized design.

Evaluation & the Health Professions, Vol. 7, No. 1, 43-51 (1984)
DOI: 10.1177/016327878400700103
Add to CiteULike CiteULike   Add to Connotea Connotea   Add to Del.icio.us Del.icio.us   Add to Digg Digg   Add to Reddit Reddit   Add to Technorati Technorati    What's this?