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Table 1 Person-level characteristics for rear-seated passengers, stratified by belt and passenger status ( n , %)

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) 2,220 (30.7) 1,531 (21.2) 7,229 536.2 (<0.0001)
Passenger characteristics       
 Passenger age (years)       233.8 (<0.0001)
  <20 492 (16.9) 69 (12.3) 474 (21.4) 257 (16.8) 1,292 (17.9)  
  20 to 44 1,652 (56.6) 182 (32.5) 1,149 (65.3) 884 (57.7) 4,167 (57.6)  
  45 to 64 510 (17.5) 117 (20.9) 239 (10.8) 240 (15.7) 1,106 (15.3)  
  ≥65 264 (9.1) 192 (34.3) 58 (2.6) 150 (9.8) 664 (9.2)  
 Passenger gender     2.3 (0.022)
  Male 1,518 (52.0) 228 (40.7) 1,327 (59.8) 868 (56.7) 3,941 (54.5)  
Driver characteristics     
 Driver age (years)     15.9 (0.0435)
  <20 353 (12.1) 64 (11.4) 342 (15.5) 243 (15.9) 1,002 (13.9)  
  20 to 44 1,571 (54.0) 240 (42.9) 1,421 (64.2) 943 (61.8) 4,175 (57.9)  
  45 to 64 713 (24.5) 163 (29.1) 345 (15.6) 256 (16.8) 1,477 (20.5)  
  ≥65 275 (9.4) 93 (16.6) 106 (4.8) 84 (5.5) 558 (7.7)  
 Driver gender       1.9 (0.1643)
  Male 2,037 (70.0) 368 (65.7) 1,633 (74.0) 1,092 (71.7) 5,130 (71.2)  
 Driver drinking or drugged       21.3 (<0.0001)
  Yes 492 (17.6) 94 (18.1) 850 (40.6) 553 (38.4) 1,989 (29.0)  
 Driver belt status     2.1 (0.1469)
  Belted 2,585 (90.5) 513 (94.8) 1,131 (52.8) 941 (64.5) 5,170 (73.9)  
  1. aChi-square and p value expressed are for the relationship between the left-hand variable in question and death.