Abstract
This study examines how an extensive set of covariates identified in previous research — sociodemographics, social stressors, health status and psychosocial resources — influence the age-depression relationship. The analyses were based on data collected for the 1994 National Population Health Survey (N = 16,291) by Statistics Canada. Analyses were conducted using OLS regression for generalized distress and logistic regression for major depressive episode. The relationship between age and both outcomes was linear and negative after controlling for sociodemographics. Controlling for social stress reduced levels of depression among younger cohorts while controlling for poor health status reduced levels of depression among the elderly. Controlling for psychosocial resources generally reduced the level of depression among older cohorts, however, the results were mixed across outcomes. The inclusion of all covariates appears to negate the effects of one another in that the fully adjusted relationships between age and depression across both outcomes were not significantly different from their bivariate relationships.
Résumé
Cette étude porte sur la manière dont un ensemble complet de covariables déterminées dans le cadre d’une étude précédente — les données sociodémographiques, les facteurs sociaux d’agression, la situation de la santé et les ressources psychosociales — influencent la relation entre l’âge et la dépression. Les analyses étaient fondées sur des données recueillies dans le cadre de l’Enquête nationale sur la santé de la population de 1994 (N = 16 291) effectuée par Statistique Canada. Les analyses ont été menées à l’aide de la méthode classique des moindres carrés pour la détresse généralisée et de la régression logistique pour les troubles dépressifs majeurs. La relation entre l’âge et les deux résultats étaient linéaire et négative après l’évaluation des données sociodémographiques. Le contrôle du stress social a permis de réduire les niveaux de dépression parmi les jeunes sujets tandis que le contrôle de la mauvaise condition physique a permis de réduire les niveaux de dépression chez les gens âgés. Le contrôle des ressources psychosociales a généralement permis de réduire les niveaux de dépression chez les sujets âgés, cependant, on est parvenu à des résultats mitigés du point de vue des conséquences. Si l’on inclut toutes les covariables, leurs influences semblent s’annuler car la relation entre l’âge et la dépression, lorsqu’elle est pleinement ajustée, n’est pas particulièrement différente de la relation à deux variables, quel que soit le résultat.
Footnotes
Support for this research was provided to John Cairney by a doctoral fellowship from the Social Science and Humanities Research Council of Canada and from the Centre for Health and Well-Being.
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