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CIHR Candrive Cohort Comparison with Canadian Household Population Holding Valid Driver’s Licenses

  • Sylvain Gagnon (a1), Shawn Marshall (a2), Yara Kadulina (a1), Arne Stinchcombe (a1), Michel Bédard (a3), Isabelle Gélinas (a4), Malcolm Man-Son-Hing (a2), Barbara Mazer (a4), Gary Naglie (a5) (a6) (a7) (a8), Michelle M. Porter (a9), Mark Rapoport (a10), Holly Tuokko (a11), Brenda Vrkljan (a12) and for the Candrive Research Team...

Abstract

We investigated whether convenience sampling is a suitable method to generate a sample of older drivers representative of the older-Canadian driver population. Using equivalence testing, we compared a large convenience sample of older drivers (Candrive II prospective cohort study) to a similarly aged population of older Canadian drivers. The Candrive sample consists of 928 community-dwelling older drivers from seven metropolitan areas of Canada. The population data was obtained from the Canadian Community Health Survey – Healthy Aging (CCHS-HA), which is a representative sample of older Canadians. The data for drivers aged 70 and older were extracted from the CCHS-HA database, for a total of 3,899 older Canadian drivers. Two samples were demonstrated as equivalent on socio-demographic, health, and driving variables that we compared, but not on driving frequency. We conclude that convenience sampling used in the Candrive study created a fairly representative sample of Canadian older drivers, with a few exceptions.

Nous avons examiné si l’échantillonnage de commodité est une méthode appropriée pour recruter un échantillon de conducteurs âgés représentatif de la population des conducteurs canadiens âgés. En utilisant des tests d’équivalence, nous avons comparé un grand échantillon de commodité de conducteurs âgés (de la cohorte Candrive II) à une population de conducteurs canadiens d’âges similaires. L’échantillon Candrive est constitué de 928 conducteurs âgés habitant dans l’une de sept régions métropolitaines du Canada. Les données démographiques relatives à la population canadienne ont été obtenues à partir de l’Enquête sur la santé dans les collectivités canadiennes – Vieillissement en santé (ESCC-VS), basé sur un échantillon représentatif de Canadiens âgés. Les données pour les conducteurs âgés de 70 ans et plus ont été extraites de la base de données de l’ESCC-VS, pour un total de 3,899 conducteurs canadiens âgés. Les deux échantillons que nous avons comparés se sont avérés équivalents en ce qui a trait aux variables socio-démographiques, relatives à la santé et à la conduite à l’exception de la fréquence d’utilisation de la voiture. Nous concluons qu’en dépit de quelques différences, l’échantillonnage de commodité utilisé dans l’étude Candrive a créé un échantillon suffisamment représentatif des conducteurs âgés au Canada.

Copyright

Corresponding author

La correspondance et les demandes de tirés-à-part doivent être adressées à: / Correspondence and requests for offprints should be sent to: Sylvain Gagnon, Ph.D. School of Psychology, University of Ottawa Cognitive Aging and Driving Laboratory 136 Jean Jacques Lussier Vanier Hall (3042) Ottawa, ON K1N 6N5 (sgagnon@uottawa.ca)

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