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Table 2 Unadjusted matched pair analysis of alcohol and food intake exposure prior to road traffic crash (RTC) and prior to the previous occurrence of driving.

From: A case-crossover study of alcohol consumption, meals and the risk of road traffic crashes

Alcohol consumption in the 6 hours prior to crash Alcohol consumption in the 6 hours prior to previous episode of driving  
  yes no total
yes 3 24 27
no 18 281 299
total 21 305 326
OR = 1.33 (95%CI: 0.69-2.60)   
Meal intake in the 2 hours prior to crash Meal intake in the 2 hours prior to previous episode of driving  
  yes no total
yes 4 25 29
no 23 276 297
total 27 301 326
OR = 1.08 (95%CI: 0.59-2.00)   
  1. Distribution of discordant window pairs, odds ratio (OR) of RTC and 95% confidence intervals (95%CI).