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Table 2 Crash- and vehicle-level characteristics, stratified by belt use and rear-seated passenger mortality

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

  Belted Unbelted Total  
  Lived Died Lived Died   Chi-square a
  n (%) n (%) n (%) n (%)   χ 2 ( p value)
Total 2,918 (40.4) 560 (7.8) 2,200 (30.7) 1,531 (21.2) 7,229  
Vehicle characteristics       
 Vehicle make year       10.4 (0.0340)
  <1994 148 (5.1) 29 (5.2) 173 (7.8) 128 (8.4) 478 (6.6)  
  1994 to 1997 347 (11.9) 76 (13.6) 376 (16.9) 261 (17.1) 1,060 (14.7)  
  1998 to 2004 1,311 (44.9) 216 (38.6) 1,170 (52.7) 745 (48.7) 3,442 (47.6)  
  2004 to 2008 776 (26.6) 163 (29.1) 401 (18.1) 310 (20.3) 1,650 (22.8)  
  2009 to 2012 336 (11.5) 76 (13.6) 100 (4.5) 87 (5.7) 599 (8.3)  
 Curb weight (lbs)       120.9 (<0.0001)
  <2,949 417 (14.6) 119 (21.9) 359 (16.5) 283 (19.0) 1,178 (16.7)  
  2,950 to 3,549 629 (22.0) 187 (34.4) 503 (23.1) 430 (28.8) 1,749 (24.8)  
  3,550 to 3,949 267 (9.3) 57 (10.5) 234 (10.8) 157 (10.5) 715 (10.1)  
  3,950 to 4,449 352 (12.3) 55 (10.1) 232 (10.7) 160 (10.7) 799 (11.3)  
  4,450 to 5,999 618 (21.6) 79 (14.6) 393 (18.1) 265 (17.8) 1,355 (19.2)  
  6,000 or more 576 (20.2) 46 (8.5) 454 (20.1) 196 (13.2) 1,272 (18.0)  
 Model type     119.0 (<0.0001)
  Convertible 10 (0.3) 0 (0.0) 5 (0.2) 8 (0.5) 23 (0.3)  
  Station wagon 76 (2.6) 22 (3.9) 24 (1.1) 26 (1.7) 148 (2.1)  
  Sedan 1,097 (37.6) 329 (58.8) 918 (41.4) 758 (49.5) 3,102 (42.9)  
  SUV 834 (28.6) 102 (18.2) 656 (29.6) 436 (28.5) 2,028 (28.1)  
  Van 466 (16.0) 71 (12.7) 299 (13.5) 141 (9.2) 977 (13.5)  
  Pickup truck 435 (14.9) 36 (6.4) 318 (14.3) 162 (10.6) 951 (13.5)  
Crash characteristics       
 Rollover       42.9 (<0.0001)
  Yes 682 (23.4) 134 (23.9) 1,049 (47.3) 741 (48.4) 2,606 (36.1)  
 Ejected       843.3 (<0.0001)
  Fully 19 (0.7) 18 (0.7) 489 (22.2) 706 (46.5) 1,232 (17.1)  
  Partially 4 (0.1) 14 (2.5) 44 (2.0) 105 (6.9) 167 (2.3)  
  Not ejected 2,891 (99.2) 527 (94.3) 1,666 (75.8) 707 (46.6) 5,791 (80.5)  
 Excessive speed       31.8 (<0.0001)
  Yes 550 (19.0) 119 (21.7) 799 (36.6) 562 (37.5) 2,030 (28.5)  
 Side       8.1 (0.0171)
  Right 1,440 (49.9) 299 (53.4) 921 (42.4) 737 (49.3) 3,397 (47.8)  
  Left 1,202 (41.7) 224 (40.0) 820 (37.8) 536 (35.9) 2,782 (39.1)  
  Middle 243 (8.4) 37 (6.6) 429 (19.8) 222 (14.8) 931 (13.1)  
 Initial point of impact       171.6 (<0.0001)
  Front 1,661 (58.3) 257 (47.1) 1,167 (54.2) 646 (43.6) 3,731 (53.1)  
  Back 354 (12.4) 87 (15.9) 110 (5.1) 132 (8.9) 683 (9.7)  
  Opposite side 221 (7.8) 43 (7.9) 160 (7.4) 86 (5.8) 510 (7.3)  
  Same side 183 (6.4) 93 (17.0) 121 (5.6) 197 (13.3) 594 (8.5)  
  Middle-seat side collision 34 (1.2) 8 (1.5) 61 (2.8) 42 (2.8) 145 (2.1)  
  No collision 304 (10.7) 45 (8.2) 447 (20.8) 320 (21.6) 1,116 (15.9)  
  Undercarriage 90 (3.2) 13 (2.4) 86 (4.0) 58 (3.9) 247 (3.5)  
  1. aChi-square and p value expressed are for the relationship between the left-hand variable in question and death. Vehicle model year (continuous) is the OR for a 1-year increase.