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The Grand Rapids dip revisited

P M Hurst1, D Harte, W J Frith

  • 1Victoria University of Wellington, New Zealand.

Accident; Analysis and Prevention
|October 1, 1994
PubMed
Summary

The "Grand Rapids Dip" in alcohol-related accident risk is a statistical artifact. Our analysis shows accident risk consistently increases with blood alcohol concentration, with frequent drinkers having lower risk at all levels.

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Area of Science:

  • Road safety research
  • Alcohol impairment studies
  • Statistical modeling in public health

Background:

  • The "Grand Rapids Dip" describes a below-baseline excursion in accident risk at low blood alcohol concentrations (BAC).
  • Previous analyses suggested demographic subgroup bias in the original 1964 Grand Rapids Study data as a cause.
  • This bias stemmed from disproportionate representation of subgroups across different BAC intervals.

Purpose of the Study:

  • To re-evaluate the relationship between blood alcohol concentration (BAC) and accident risk.
  • To correct for demographic biases identified in previous analyses of the Grand Rapids data.
  • To determine if the "Grand Rapids Dip" persists after statistical adjustment.

Main Methods:

  • Development of a realistic statistical model to analyze the 1964 Grand Rapids Study data.
  • Derivation of a single relative-hazard curve, adjusted for demographic subgroup representation.
  • Comparison of accident risk across different BAC levels and self-reported drinking frequencies.

Main Results:

  • The adjusted relative-hazard curve demonstrates a monotonic increase in accident risk with rising BAC.
  • The "Grand Rapids Dip" is shown to be a distortion caused by unequal subgroup representation.
  • More frequent drinkers exhibited lower accident risk across all BAC levels, including zero, compared to less frequent drinkers.

Conclusions:

  • The "Grand Rapids Dip" is not a true reflection of alcohol's effect on accident risk at low BAC levels.
  • Accident risk increases with BAC, irrespective of drinking frequency.
  • Drinking frequency is a significant factor influencing accident risk at any given BAC level.

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