Problématique : L’amélioration de l’accessibilité financière aux soins de santé est essentielle pour réduire la morbidité et de la mortalité infantile dans les pays à ressources limitées. Cependant, les preuves disponibles sur la relation entre un accès accru aux soins et l’amélioration la santé infantile, dans le long terme, demeurent insuffisantes et parfois inconnues. Dans le contexte spécifique de la région du Sahel au Burkina Faso où les niveaux élevés de morbidité et de malnutrition coïncident avec un faible recours aux soins, une intervention de santé publique associant la gratuité des soins à l’amélioration de la qualité des soins et à la prise en charge de la malnutrition dans la communauté a été mise en œuvre en septembre 2008. Objectifs : En utilisant des approches statistiques et épidémiologiques appliquées aux données transversales et de séries chronologiques, cette thèse vise à apporter une meilleure compréhension de la façon dont la présence de l’intervention dans les communautés peut augmenter et maintenir l’utilisation des services de santé à long terme et améliorer la santé des enfants de moins de cinq ans. Les objectifs spécifiques sont : 1) évaluer le maintien à long terme des effets de l’intervention sur l’utilisation des services de santé chez les enfants de moins de cinq ans, 2) évaluer l’effet contextuel de l’intervention, quatre ans après le début de sa mise en œuvre, sur la probabilité de survenue d’une maladie et sur la probabilité d’utilisation des services de santé chez les enfants de moins de cinq ans, et 3) évaluer l’effet contextuel de l’intervention, quatre ans après le début de sa mise en œuvre, sur le retard de croissance chez les enfants de moins de cinq ans. Méthodes : Les données proviennent du système national d’information sanitaire, d’une enquête rétrospective sur les services de santé ainsi que d’une enquête de ménages réalisée quatre ans après le début de l’intervention dans 41 villages du district d’intervention et 51 villages du district de comparaison. Nous avons utilisé un plan quasi expérimental à séries temporelles interrompues avec groupe de comparaison pour évaluer les effets immédiats et à long terme de l’intervention sur les taux d’utilisation des services de santé. Ensuite, un plan d’étude transversale post-intervention avec un groupe de comparaison nous a permis d’évaluer l’effet contextuel de l’intervention sur la probabilité de survenue d’une maladie, sur la probabilité d’utilisation des services de santé et sur le retard de croissance chez les enfants de moins de cinq ans. La stratégie analytique a combiné la méthode de pondération par les scores de propension pour équilibrer les covariables entre les deux groupes, la modélisation binomiale négative à effets mixtes, les régressions linéaire et logistique multiniveaux. Résultats : L’intervention de gratuité des soins associée à l’amélioration de la qualité des soins et à la prise en charge de la malnutrition dans la communauté était associée à l’augmentation et au maintien de l’utilisation des services de santé au-delà de quatre ans (ratio des taux d’incidence = 2,33 ; IC 95 % = 1,98 – 2,67). En outre, comparativement aux enfants vivant dans le district de contrôle, la probabilité d’utiliser les services de santé était de 17,2 % plus élevée chez les enfants vivant dans le district d’intervention (IC 95 % = 15,01–26,6) ; et de 20,7 % plus élevée lorsque l’épisode de maladie était sévère (IC 95 % = 9,9–31,5). Ces associations étaient significatives, quels que soient la distance par rapport aux centres de santé et le statut socio-économique du ménage. Par ailleurs, alors que le contexte de résidence expliquait 9,36 % de la variance du retard de croissance (corrélation intraclasse = 9,36 % ; IC 95 % = 6,45–13,38), la présence de l’intervention dans les villages n’explique que 2 % de la variance du retard de croissance. Cependant, nous n’avons pas pu démontrer que la présence de l’intervention dans les communautés était associée à une réduction de la probabilité de survenue d’un épisode de maladie (Différentiel des probabilités = 4.4 ; IC 95% = -1.0 – 9.8), ni à une amélioration significative de l’état nutritionnel des enfants de moins de cinq ans (RC = 1,13 ; IC 95 % = 0,83–1,54). Conclusion : Cette thèse souligne que la gratuité des soins associée à l’amélioration de la qualité des soins et à la prise en charge de la malnutrition dans la communauté est efficace pour augmenter et maintenir l’utilisation des services de santé et réduire les inégalités géographiques de recours aux soins. Cependant, cette intervention n’était pas associée à une amélioration des résultats de santé infantile. Bien que des études longitudinales rigoureuses soient nécessaires pour comprendre pleinement l’influence potentielle de cette intervention sur la morbidité, cette thèse plaide pour la nécessité d’agir simultanément sur les autres déterminants sociaux de la santé et d’intégrer, de manière synergique, des interventions spécifiques à la nutrition pour plus d’impact sur la santé infantile. / Introduction: Improving financial access to health care is believed to be essential for reducing the burden of child morbidity and mortality in resource-limited settings, but the available evidence on the relationship between increased access and health remains scarce and the long-term issues are still unknown. In the specific context of the Sahel region in Burkina Faso where high levels of morbidity and malnutrition coincide with low health care use, a pilot intervention for free health care including quality of care improvement and management of malnutrition at the community level was implemented in September 2008. Objectives: Using statistical and epidemiological approaches applied to cross-sectional and time series data, this thesis aims to provide a better understanding of how the presence of intervention in communities can increase and maintain long-term use of health services and improve the health of children under five years. The specific objectives are: 1) to evaluate the long-term effects of the intervention on the use of health services in children under the age of five, 2) to estimate the contextual effect of intervention on the probability of occurrence of and the likelihood of health services being used by children under five, four years after the start of its implementation, and 3) to evaluate the contextual effect of the intervention on stunting in children under five, four years after the start of its implementation. Methods: The data for the analyses were provided from a variety of sources including the national health information system, a retrospective health services survey, and a household survey conducted four years after the intervention onset in 41 villages in the intervention district and 51 villages in the comparison district. We used a quasi-experimental controlled interrupted time-series design group to analyze the immediate and long-term effects of the intervention on the rate of health services utilization in children under five. Then, a quasi-experimental post-test-only design that included a control group allowed us to evaluate the contextual effect of the intervention on the probability of occurrence of a disease, on the probability of use of health services, and stunting in children under five. The analytic strategy combined the propensity score weighting method to balance the covariates between the two groups, two-level mixed-effects negative binomial, and linear and logistic regression models to account for the hierarchical structure of data. Results: The intervention for free health care including quality of care improvement and management of malnutrition at the community level was associated with an increased and maintained use of health services beyond four years after the onset of intervention (incidence rate ratio = 2.33; 95% CI = 1.98–2.67). In addition, compared to children living in the comparison district, the probability of using health services was 17.2% higher among those living in the intervention district (95% CI = 15.0–26.6); and 20.7% higher when the illness episode was severe (95% CI = 9.9–31.5). These associations were significant regardless of the distance to health centers and the socio-economic status of households. In addition, inequalities in the use of care were less pronounced in the intervention villages compared to those in the control village. Finally, the results also showed that the residence context accounted for 9.36% of the variance in stunting (intra-class correlation = 9.36% ; 95% CI = 6.45–13.38), and only 2% of the variance in stunting was explained by the intervention. However, we could not demonstrate that the intervention in these communities was associated with a reduced probability of an illness occurring (AME=4.4 (95% CI: -1.0 – 9.8), nor with a significant improvement in the nutritional status among children under five (OR = 1.13; 95% CI = 0.83–1.54). Conclusion: This thesis underlines the importance that affordable health care, including quality of care, as well as improving the management of malnutrition at the community level, are effective in increasing and maintaining the use of health services and reduce geographical inequalities in the use of care. However, this intervention was not associated with improved child health outcomes. Although rigorous longitudinal studies are necessary to fully understand the potential influence of this intervention on morbidity, this thesis highlights the need to simultaneously act on other social determinants of health and to synergistically integrate nutrition-specific interventions for greater impact on child health.

“Why do immigrants and refugees need community health workers/lay health workers (CHWs) if Canada already has a universal health care system?” Abundant evidence demonstrates that despite the universality of our health care system marginalized populations, including immigrants and refugees, experience barriers to accessing the health system. Evidence on the role of CHWs facilitating access is both lacking and urgently needed. This dissertation contributes to this evidence by providing a thick description and thorough analytical exploration of a CHW model, in Edmonton, Canada. Specifically, I examine the activities of the Multicultural Health Brokers Co-operative (MCHB Co-op) and its Multicultural Health Brokers from 1992 to 2011 as well as the relationship they have with Alberta Health Services (AHS) Edmonton Zone Public Health. The research for this study is based on an instrumental and embedded qualitative case study design. The case is the MCHB Co-op, an independently-run multicultural health worker co-operative, which contracts with health and social services providers in Edmonton to offer linguistically- and culturally-appropriate services to marginalized immigrant and refugee women and their families. The two embedded mini-cases are two programs of the MCHB Co-op: Perinatal Outreach and Health for Two, which are the raison d’être for a sustained partnership between the MCHB Co-op and AHS. The phenomenon under study is the Multicultural Health Brokers’ practice. I triangulate multiple methods (research strategies and data sources), including 46 days of participant and direct observation, 44 in-depth interviews (with Multicultural Health Brokers, mentors, women using the programs, health professionals and outsiders who knew of the work of the MCHB Co-op and Multicultural Health Brokers), and document review and analysis of policy documents, yearly reports, training manuals, educational materials as well as quantitative analysis of the Health Brokers’ 3,442 client caseload database. In addition, data include my field notes of both descriptive and analytical reflections taken throughout the onsite research. I also triangulate various theoretical frameworks to explore how historically specific social structures, economic relationships, and ideological assumptions serve to create and reinforce the conditions that give rise to the need for CHWs, and the factors that aid or hinder their ability to facilitate marginalized populations’ access to health and social services. Findings reveal that Multicultural Health Brokers facilitate access to health and social services as well as foster community capacity building in order to address settlement, adaptation, and integration of immigrant and refugee women and their families into Canadian society. Findings also demonstrate that the Multicultural Health Broker model is an example of collaboration between community-based organizations and local systems in targeting health equity for marginalized populations; in particular, in perinatal health and violence against women. A major problem these workers face is they provide important services as part of Canada’s health human resources workforce, but their contributions are often not recognized as such. The triangulation of methods and theory provides empirical and theoretical understanding of the Multicultural Health Brokers’ contribution to immigrant and refugee women and their families’ feminist urban citizenship.

“Why do immigrants and refugees need community health workers/lay health workers (CHWs) if Canada already has a universal health care system?” Abundant evidence demonstrates that despite the universality of our health care system marginalized populations, including immigrants and refugees, experience barriers to accessing the health system. Evidence on the role of CHWs facilitating access is both lacking and urgently needed. This dissertation contributes to this evidence by providing a thick description and thorough analytical exploration of a CHW model, in Edmonton, Canada. Specifically, I examine the activities of the Multicultural Health Brokers Co-operative (MCHB Co-op) and its Multicultural Health Brokers from 1992 to 2011 as well as the relationship they have with Alberta Health Services (AHS) Edmonton Zone Public Health. The research for this study is based on an instrumental and embedded qualitative case study design. The case is the MCHB Co-op, an independently-run multicultural health worker co-operative, which contracts with health and social services providers in Edmonton to offer linguistically- and culturally-appropriate services to marginalized immigrant and refugee women and their families. The two embedded mini-cases are two programs of the MCHB Co-op: Perinatal Outreach and Health for Two, which are the raison d’être for a sustained partnership between the MCHB Co-op and AHS. The phenomenon under study is the Multicultural Health Brokers’ practice. I triangulate multiple methods (research strategies and data sources), including 46 days of participant and direct observation, 44 in-depth interviews (with Multicultural Health Brokers, mentors, women using the programs, health professionals and outsiders who knew of the work of the MCHB Co-op and Multicultural Health Brokers), and document review and analysis of policy documents, yearly reports, training manuals, educational materials as well as quantitative analysis of the Health Brokers’ 3,442 client caseload database. In addition, data include my field notes of both descriptive and analytical reflections taken throughout the onsite research. I also triangulate various theoretical frameworks to explore how historically specific social structures, economic relationships, and ideological assumptions serve to create and reinforce the conditions that give rise to the need for CHWs, and the factors that aid or hinder their ability to facilitate marginalized populations’ access to health and social services. Findings reveal that Multicultural Health Brokers facilitate access to health and social services as well as foster community capacity building in order to address settlement, adaptation, and integration of immigrant and refugee women and their families into Canadian society. Findings also demonstrate that the Multicultural Health Broker model is an example of collaboration between community-based organizations and local systems in targeting health equity for marginalized populations; in particular, in perinatal health and violence against women. A major problem these workers face is they provide important services as part of Canada’s health human resources workforce, but their contributions are often not recognized as such. The triangulation of methods and theory provides empirical and theoretical understanding of the Multicultural Health Brokers’ contribution to immigrant and refugee women and their families’ feminist urban citizenship.

“Why do immigrants and refugees need community health workers/lay health workers (CHWs) if Canada already has a universal health care system?” Abundant evidence demonstrates that despite the universality of our health care system marginalized populations, including immigrants and refugees, experience barriers to accessing the health system. Evidence on the role of CHWs facilitating access is both lacking and urgently needed. This dissertation contributes to this evidence by providing a thick description and thorough analytical exploration of a CHW model, in Edmonton, Canada. Specifically, I examine the activities of the Multicultural Health Brokers Co-operative (MCHB Co-op) and its Multicultural Health Brokers from 1992 to 2011 as well as the relationship they have with Alberta Health Services (AHS) Edmonton Zone Public Health. The research for this study is based on an instrumental and embedded qualitative case study design. The case is the MCHB Co-op, an independently-run multicultural health worker co-operative, which contracts with health and social services providers in Edmonton to offer linguistically- and culturally-appropriate services to marginalized immigrant and refugee women and their families. The two embedded mini-cases are two programs of the MCHB Co-op: Perinatal Outreach and Health for Two, which are the raison d’être for a sustained partnership between the MCHB Co-op and AHS. The phenomenon under study is the Multicultural Health Brokers’ practice. I triangulate multiple methods (research strategies and data sources), including 46 days of participant and direct observation, 44 in-depth interviews (with Multicultural Health Brokers, mentors, women using the programs, health professionals and outsiders who knew of the work of the MCHB Co-op and Multicultural Health Brokers), and document review and analysis of policy documents, yearly reports, training manuals, educational materials as well as quantitative analysis of the Health Brokers’ 3,442 client caseload database. In addition, data include my field notes of both descriptive and analytical reflections taken throughout the onsite research. I also triangulate various theoretical frameworks to explore how historically specific social structures, economic relationships, and ideological assumptions serve to create and reinforce the conditions that give rise to the need for CHWs, and the factors that aid or hinder their ability to facilitate marginalized populations’ access to health and social services. Findings reveal that Multicultural Health Brokers facilitate access to health and social services as well as foster community capacity building in order to address settlement, adaptation, and integration of immigrant and refugee women and their families into Canadian society. Findings also demonstrate that the Multicultural Health Broker model is an example of collaboration between community-based organizations and local systems in targeting health equity for marginalized populations; in particular, in perinatal health and violence against women. A major problem these workers face is they provide important services as part of Canada’s health human resources workforce, but their contributions are often not recognized as such. The triangulation of methods and theory provides empirical and theoretical understanding of the Multicultural Health Brokers’ contribution to immigrant and refugee women and their families’ feminist urban citizenship.