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Table 3 Odds ratios (with 95% CIs) for mortality using unadjusted, adjusted, and multilevel multivariable logistic regression

From: Factors associated with mortality in rear-seated adult passengers involved in fatal motor vehicle crashes on US roadways

  Unadjusted mortality Belt status adjusted mortality Multivariable multilevel mortality
Passenger belted 0.28 (0.25, 0.31) - 0.33 (0.28, 0.39)
Passenger age (years)    
 18 to 19 Ref Ref Ref
 20 to 29 0.99 (0.86, 1.16) 0.97 (0.83, 1.14 ) 1.17 (0.95, 1.46)
 30 to 39 1.05 (0.87, 1.27) 1.14 (0.94, 1.40 ) 1.71 (1.32, 2.21)
 40 to 49 1.27 (1.04, 1.57) 1.40 (1.13, 1.74 ) 2.28 (1.72, 3.10)
 50 to 59 1.27 (1.02, 1.59) 1.67 (1.32, 2.11 ) 3.00 (2.21, 4.06)
 60 to 69 1.87 (1.47, 2.38) 3.06 (2.36, 3.97 ) 6.53 (4.67, 9.14)
 70 to 79 2.61 (2.00, 3.41) 4.56 (3.41, 6.10 ) 8.98 (6.15, 13.11)
 Over 80 5.67 (4.16, 7.72) 11.09 (7.96, 15.45 ) 26.68 (17.55, 40.56)
Passenger male 0.89 (0.80, 0.98) 0.79 (0.71, 0.88) 0.96 (0.84, 1.09)
Rear seat position    
 Middle Ref Ref  
 Right 1.14 (0.97, 1.34) 1.50 (1.27. 1.77)  
 Left 0.98 (0.83, 1.15) 1.27 (1.07, 1.51)  
Driver age    
 <16 1.41 (0.91, 2.18) 1.45 (0.92, 2.29) 1.35 (0.77, 2.35)
 17 to 19 Ref Ref Ref
 20 to 29 0.99 (0.84, 1.16) 0.96 (0.81, 1.14) 0.81 (0.65, 1.01)
 30 to 39 0.83 (0.68, 1.01) 0.90 (0.73, 1.10) 0.71 (0.54, 0.93)
 40 to 49 0.87 (0.71, 1.07) 0.99 (0.80, 1.23) 0.61 (0.45, 0.81)
 50 to 59 0.95 (0.77, 1.18) 1.23 (0.98, 1.54) 0.71 (0.52, 0.97)
 60 to 69 0.97 (0.76, 1.24) 1.34 (1.04, 1.73) 0.59 (0.41, 0.83)
 70 to 79 0.94 (0.70, 1.28) 1.42 (1.03, 1.95) 0.37 (0.24, 0.58)
 Over 80 1.45 (1.01, 2.41) 2.35 (1.49, 3.72) 0.34 (0.24, 0.62)
Driver drinking or drugged 1.30 (1.16, 1.46) 0.94 (0.83, 1.06)  
Vehicle model year (continuous)a 0.99 (0.98, 1.00) 1.01 (1.00, 1.02)  
Vehicle model yearb    
 <1994 Ref Ref  
 1994 to 1997 0.94 (0.74, 1.18) 0.99 (0.78, 1.25)  
 1998 to 2004 0.78 (0.64, 0.96) 0.85 (0.69, 1.06)  
 2005 to 2008 0.81 (0.65, 1.01) 1.05 (0.84, 1.32)  
 2009 to 2012 0.75 (0.58, 0.98) 1.16 (0.88, 1.52)  
Model type    
 Sedan Ref Ref Ref
 Pickup 0.49 (0.41, 0.58) 0.48 (0.40, 0.58) 0.86 (0.59, 1.25)
 SUV 0.67 (0.59, 0.76) 0.65 (0.57, 0.74) 0.64 (0.50, 0.81)
 Van 0.51 (0.43, 0.61) 0.55 (0.46, 0.65) 0.62 (0.46, 0.84)
 Convertible 1.00 (0.42, 2.34) 0.96 (0.39, 2.35) 0.60 (0.19, 1.90)
 Station wagon 0.89 (0.63, 1.27) 1.16 (0.81, 1.68) 1.01 (0.64, 1.59)
Vehicle curb weight (lbs)    
 <2,949 Ref Ref Ref
 2,950 to 3,549 1.05 (0.90, 1.23) 1.07 (0.91, 1.26) 1.11 (0.91, 1.35)
 3,550 to 3,949 0.83 (0.68, 1.01) 0.81 (0.66, 1.00) 0.89 (0.67, 1.17)
 3,950 to 4,449 0.71 (0.58, 0.87) 0.74 (0.60, 0.91) 0.84 (0.62, 1.14)
 4,450 to 5,999 0.66 (0.55, 0.78) 0.69 (0.57, 0.82) 0.80 (0.58, 1.10)
 6,000 or more 0.45 (0.38, 0.55) 0.45 (0.37, 0.54) 0.52 (0.36, 0.77)
Not ejected Ref Ref Ref
 Ejected fully 5.26 (4.62, 5.99) 3.49 (3.03, 4.02) 4.86 (4.07, 5.81)
 Ejected partially 9.15 (6.50, 12.86) 6.54 (4.63, 9.25) 8.46 (5.71, 12.52)
Initial impact point    
 Front Ref Ref Ref
 Back 1.48 (1.24, 1.77) 1.85 (1.53, 2.23) 1.83 (1.46, 2.30)
 Middle seat, side crash 1.65 (1.16, 2.34) 1.29 (0.89, 1.85) 1.28 (0.84, 1.97)
 Opposite side 1.06 (0.86, 1.31) 1.07 (0.86, 1.34) 0.84 (0.65, 1.10)
 Same side 2.99 (2.50, 3.57) 3.11 (2.58, 3.75) 2.76 (2.22, 3.44)
 Undercarriage 1.26 (0.95, 1.68) 1.13 (0.84, 1.52) 1.06 (0.74, 1.50)
 Non-collision 1.53 (1.32, 1.77) 1.22 (1.05, 1.42) 1.03 (0.84, 1.25)
Rollover 1.42 (1.28, 1.57) 1.04 (0.93, 1.16 )  
Excessive speed 1.38 (1.23, 1.54) 1.07 (0.96, 1.21) 1.25 (1.07, 1.45)
  1. aVehicle model year (continuous) is the OR for a 1-year increase. bVehicle model year was considered as both continuous and categorical; in adjusted models, it was adjusted for once.