Organizing for cancer control. The diffusion of a dynamic innovation in a community cancer network.

This paper examines the diffusion of a "dynamic" innovation--research on the prevention and control of cancer--in a community cancer network. By analyzing the social structures and communication strategies of network members, as well as the attributes of the innovation, the authors explain why this innovation is diffusing more slowly than its "formed" counterpart--research on the treatment of cancer.

Designing clinical protocols for optimal use: measuring attributes of treatment and cancer control trials.

The design of clinical protocols is an important factor in assuring patient accrual and compliance. This paper describes the methods used to assess the attributes of treatment and cancer control research protocols. Measures are presented for assessing three attributes considered important: relative advantage, complexity, and compatibility.

The role of thematic evaluation in program assessment: the case of the Community Clinical Oncology Program.

The evaluation of programs with multiple, and potentially conflicting, goals requires the integration of measures of goal achievement that often are not easily combined. One approach is the development of analytical themes which span the various goals of a particular program. The themes provide a mechanism by which the policy concerns of individuals with varying perspectives can be integrated into the evaluation framework. As well, the themes allow for flexibility in the development of new analysis as the program matures and environments change. This paper describes the application of the thematic approach to the evaluation of a complex, community-oriented cancer research program.

Cesarean section in Ontario: practice patterns and responses to hypothetical cases.

A 40% random sample of Ontario's obstetricians were asked to respond to hypothetical scenarios for previous cesarean section, breech presentation and dystocia, and to describe their practice patterns. Their responses confirmed findings from other studies, which reported differences between physicians' responses to hypothetical cases and their actual practice. In this study, 18% chose a cesarean section for the hypothetical case of a patient who had previously undergone cesarean section and 2% chose a cesarean section for the hypothetical case of breech presentation. However, in practice, the obstetricians reported that they do cesarean section on 71% of their previous section patients and on 57% of their breech patients. Physicians in teaching hospitals were less likely than those in community hospitals to choose cesarean section for a woman who had previously undergone cesarean section both hypothetically and in practice. For breech presentation, no difference was found. The discrepancy between responses to the hypothetical cases and practice patterns could not be attributed to the absence of anesthesia services or to restrictive hospital policies.

The impact of selected patient characteristics on practitioners' treatment recommendations for end-stage renal disease.

Medical decision making under uncertainty was tested using an empirical study of practitioner judgments concerning the preferred treatment(s) for end-stage renal disease (ESRD) patients. Patient-specific factors were varied systematically in written case vignettes, which were mailed to physician and nonphysician practitioners who treated ESRD patients in Canada and Michigan. Respondents were asked to indicate for each vignette: a preferred treatment and all other acceptable treatments. Overall patterns of choice were analyzed; the clear preferences shown for certain treatment modalities (e.g., for continuous ambulatory peritoneal dialysis over home hemodialysis) have planning implications. The apparent receptivity to new ESRD treatments may affect the success of government policies aimed at encouraging greater use of home hemodialysis. The impact of each patient-specific variable on treatment choice was also examined. Factors such as the patient's age proved to be major determinants both of the preferred treatment modalities and of the number of alternatives considered acceptable. The research method allowed areas of medical consensus to be distinguished from those 'grey areas' in which patient characteristics alone could not explain treatment selection. The resulting 'controversy' cases are being used as the dependent variables in further studies.

Five-year study of surgical rates in Ontario's counties.

The surgical rates for eight operations (hysterectomy, tonsillectomy/adenoidectomy, cholecystectomy, prostatectomy, appendectomy, mastectomy, colectomy and cesarean section) done in Ontario's 44 counties from 1973 to 1977 were examined. There was considerable variation among the counties for all the operations studied, although the degree of intercounty variation decreased over the 5 years. Differences in resources (hospital beds and surgeons) explained little of the variation in the rates, but this may be because people crossed county lines for certain operations. Although some counties had consistently high or low rates for individual operations during the 5-year period, only four had consistently high rates for four or more operations, and only five had consistently low rates for four or more. The five counties with teaching health science centres had the highest ratios of specialists and surgeons to population, and, with the exception of one county in 1973, had above-average numbers of hospital beds. Despite the greater resources in these counties, their residents had consistently low rates for cholecystectomy, appendectomy, mastectomy and tonsillectomy/adenoidectomy. However, three of these counties had the highest rates for cesarean section. The variation in the rates is likely due to lack of agreement about indications for surgery or to variation in the use of technology rather than to differences in the incidence or prevalence of disorders.