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