Table 1

 Occupant, vehicle, and collision characteristics of at risk subjects by exposure (contiguous occupants’ restraint use) group

Exposed (unbelted)Unexposed (belted)Total (%)p Value
Number of sample subjects (%)28429 (18.7)123762 (81.3)152191 (100)
Weighted number of subjects (%)3060029 (16.6)15366655 (83.4)18426684 (100)
Occupant
    Age in years, mean (SE)27.5 (0.25)28.8 (0.25)28.6 (0.23)<0.001
    Gender (%)<0.001
        Male55.747.949.2
        Female44.352.150.8
    Seating position (%)<0.001
        Driver42.740.040.4
        Front seat outboard42.237.838.6
        Row 2 driver’s side and outboard15.222.221.1
    Seat belt use (%)<0.001
        Belted35.094.584.6
        Unbelted65.15.515.4
    Injury (%)<0.001
        Any injury17.67.28.9
         Non-incapacitating10.24.65.5
         Incapacitating6.12.22.9
         Death0.70.10.2
Vehicle
    Vehicle type (%)<0.001
        Automobile75.972.372.9
        Sports utility vehicle5.17.77.2
        Van/minivan6.59.59.0
        Pickup truck7.47.67.6
        Other5.03.03.3
    Curb weight in lbs (%)<0.001
        <250026.022.322.8
        2500–300026.928.328.1
        >300047.149.549.1
Collision
    Crash type (%)<0.001
        Frontal41.924.527.4
        Side50.058.156.8
        Rear8.117.415.9
    Collision severity (%)<0.001
        Minor31.637.736.7
        Moderate/severe68.462.363.3
    Mean (SE) travel speed in mph26.9 (0.43)23.2 (0.40)23.8 (0.40)<0.001