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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.