La pratique médicale des omnipraticiens : 
influence des contextes organisationnel et géographique

Health services utilization is central to healthcare organization. Understanding the processes that determine utilization is essential to influence the health system and to ensure that it better meets the needs of the population.  The objective of this thesis is to understand the complex phenomenon of health services utilization by looking at general practitioners' practices.  Using Donabedian's theoretical framework, we decomposed determinants of utilization at three levels: individual, organizational and environmental. We chose a configurational approach to account for the complex nature of the phenomenon under study. Our question is the following: To what extent does the type of practice influence delivery of health services, and how do geographical environment and patient populations mediate this relationship?  We used combined data sources from the Collège des médecins du Québec, the Régie de l'assurance maladie du Québec and the iCLSC databases. Almost 70% of family physicians practicing in 2002 met the selection criteria. Multiple correspondence analyses and ascending hierarchical classifications were used to create a taxonomy of practices and a taxonomy of geographical contexts. We constructed services utilization indicators to assess continuity, comprehensiveness, accessibility and productivity. These indicators were validated using a population survey. The results first present physicians' profiles of practice. Two single-site profiles emerged. Private clinic practice is characterized by high levels of continuity and productivity. CLSC practice is typified by low productivity level and slightly above average levels of comprehensiveness and accessibility. Five other practice profiles include physicians who practice in different combinations of sites (multi-sites profiles). Two multi-institutional profiles of practice include physicians who divide their time in two different patterns, among emergency departments, hospital centres and private clinics or CLSCs. The levels of accessibility and productivity for physicians in these two groups are very high. The profile combining private clinics and long-term care facilities (the less active profile) includes physicians with below average productivity, and very high level of continuity. An ambulatory practice profile includes physicians who work in CLSCs, private clinics and long-term care facilities. Physicians in this profile, show low levels for all indicators. Finally, the hospital-based practice includes physicians who practice mainly in hospitals but also occasionally in private clinics.  Our analyses highlighted four groups of CSSS territories: rural, semi-urban, urban, and metropolitan. The prevalence of practice profiles vary based on context. In rural settings, about a third of physicians opt for multi-institutional practices. In semi-urban settings, physicians predominantly work in practices that include a CLSC component. In urban settings, more physicians choose a profile of practice with a private clinic component.  Finally, in metropolitan areas, the less active and more hospital-based type of practice attracts close to 40% of physicians. General practitioners are almost equally split among the other profiles of practices. Indicator levels vary according to geographical environment. As a result, accessibility increases with level of rurality. Conversely, productivity increases with level of urbanity. Continuity of care is higher in metropolitan and rural areas. Comprehensiveness changes little among contexts. We will refer back to the initial research question to look at the results and compare them with the literature. To offset the shortcomings of the limited analysis of physicians' practice organization found in the literature, we defined type of practice concept as the configuration of each physician's professional practice site To our knowledge, no other study reported in the literature has analyzed four service utilization indicators simultaneously to assess delivery of medical services.  Results of our analyses show that there is a difference in service delivery based on type of practice. Some results are documented in the literature, especially as regards single-site type of practice.  We will then present the relationships among indicators. Care continuity and comprehensiveness seem to be evolving in the same direction. Productivity and accessibility are also positively correlated. However, there is a certain tension between the former and the latter indicators. Only single-site types do not fit the indicators, as articulated in the state of current knowledge. No type of practice showed high levels for the four indicators. It is therefore necessary to work on combinations of practice types in the territories to offer the population the services required to reach all four care delivery objectives.  Emerging types of practice (which attract young doctors) and those that are dying out (where the prevalence of older physicians is highest) are discussed in the next section. It should be noted that the types of practice that are vanishing address the population's health needs better than emerging types, in terms of indicators. In conclusion, this thesis presents three theoretical and three methodological contributions. The implications for future research and decision making point out that if no measures are implemented to reverse the trend, Quebec risks to see deficiencies in delivery of services in terms of continuity, comprehensiveness and accessibility.

Keyphrases: Physician practice, Use of health services, Configurational approach, Family medicine, Delivery of health services, Practice setting profile