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Table 4 Distribution of cases and controls according to history

From: Effect of wearing a helmet on the occurrence of head injuries in motorcycle riders in Benin: a case-control study

Variables Head injuries (% or Mean ± sd) p-value
Yes (n = 242) No (n = 484)
Medical history    0.003
Yes 11.2 19.8  
No 88.8 80.2  
History of traffic crashes    0.327
Yes 39.3 35.3  
No 60.7 64.7  
Sleeping pill consumption    1.000
Yes 2.9 2.9  
No 97.1 97.1  
Consumption of stimulants/doping substances    0.657
Yes 5.4 6.2  
No 94.6 93.8  
Consumption of alcoholic beverages    0.503
Yes 65.3 67.8  
No 34.7 32.2  
Tobacco consumption    0.623
Yes 10.7 12.0  
No 89.3 88.0  
Motorcycle riding experience (years) 15.7 (10.3) 16.8 (10.2) 0.177