BAC and Crash Responsibility of Injured Older Drivers: An Analysis of Trauma Center Data

Blomberg, R. D.; Thomas, F. Dennis; Sifrit, Kathy J.; Korbelak, Kristopher T. · 2014 · ROSA P / Dunlap and Associates, Inc.

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Summary

This study investigates the prevalence of alcohol impairment among older drivers (aged 65 and older) involved in crashes requiring trauma center treatment, examining the relationship between blood alcohol concentration (BAC), prior driving records, and crash responsibility. Motivated by gaps in existing research regarding alcohol’s specific impact on older driver safety, the authors sought to determine the proportion of older drivers with positive BACs, their average BAC levels, and whether their driving histories and crash culpability differed from sober peers. The researchers conducted a retrospective analysis of 11 years (2000–2010) of data from the Oregon Trauma Registry, encompassing 83,841 patients aged 18 and older, including 15,900 patients aged 65 and older. A subsample of 660 drivers aged 65 and older was linked to driver records from the Oregon Department of Motor Vehicles and police crash reports to assess prior violations and crash fault. BACs below 0.020 g/dL were considered negative, while those at or above 0.020 g/dL were considered positive. The results revealed that older drivers were significantly less likely to have BAC testing performed compared to younger age groups, with only 53.2% of trauma patients and 65.7% of drivers aged 65+ having recorded BACs. Among those tested, approximately 10.1% of crash-involved drivers aged 65+ had positive BACs, a rate substantially lower than younger drivers. However, among those who tested positive, BAC levels were high; the mean BAC was 0.185 g/dL, and 60.3% had BACs at or above 0.160 g/dL. Drivers with positive BACs had notably worse driving records than those with negative BACs, with 62.1% having at least one conviction and 53% having at least one suspension, compared to roughly 37% and 26% respectively for sober drivers. Furthermore, crash responsibility analysis showed that 96.0% of older drivers with positive BACs were deemed responsible for their crashes, compared to 77.8% of those with negative BACs. The study concludes that while alcohol is less frequently a factor in crashes involving older drivers compared to younger drivers, its impact is severe when present. Older drivers who test positive typically have BACs well above the legal limit and exhibit poor prior driving records and high crash responsibility. These findings suggest that alcohol impairs older drivers significantly beyond the effects of aging alone, highlighting a critical need for targeted countermeasures and increased attention to drinking drivers aged 65 and older.

Key finding

Older drivers with positive BACs were attributed crash responsibility in 96.0% of cases and had a mean BAC of 0.185 g/dL, significantly higher than the responsibility rate of 77.8% for older drivers with negative BACs.

Methodology

dataset

Sample size: 1392

Provenance

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Summary generated by qwen3.6-27b-prismaquant on 2026-06-10; verification: verified.

Topics

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• alcohol
• incidence prevalence

Information type

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• Empirical Findings: crash risk outcomes