JSM 2004 - Toronto

Abstract #300816

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Activity Number: 21
Type: Contributed
Date/Time: Sunday, August 8, 2004 : 2:00 PM to 3:50 PM
Sponsor: Section on Health Policy Statistics
Abstract - #300816
Title: A New Design for the Canadian National Seat Belt Survey
Author(s): Aline Chouinard*+
Companies: Transport Canada
Address: 330 Sparks St., Ottawa, ON, K1A 0N5, Canada
Keywords: seat belt survey ; observational survey ; low traffic volume ; spatial data
Abstract:

The National Seat Belt Survey, an observational survey designed in 1978 and conducted almost annually until 2001. Despite the overall national seat belt usage rate of 89.9% ±0.6 in 2001, an average of 40% of all vehicle occupants killed and 21% of those seriously injured are still unbelted at the time of a collision. The National Seat Belt Survey was redesigned in 2001 to include rural communities into the survey. The design comprises several stratification levels and multiple stages of sampling. The stratification levels are the province, the region, and the rural/urban strata. The strata definition not only takes into account the population size of communities but also their population density and proximity (or lack thereof) to a city. An inventory of all the intersections contained within each stratum is obtained from the Canadian Highway Information System. The stages of sampling include the selection of the intersections, the day of the week, and the time of day. Sampling schemes that minimize the risk of sampling intersections with low traffic volumes will be presented. Finally, the estimation model for calculating the seat belt usage rate will be discussed.

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