Child and Driver Characteristics of the Study Sample
| Characteristic | Overall, Weighted % (Unweighted n) (N = 7151) | BPB Seat, Weighted % (Unweighted n) (N = 1604) | Seat Belt, Weighted % (Unweighted n) (N = 5547) | Pa |
|---|---|---|---|---|
| Child characteristics | ||||
| Age, y | <.001 | |||
| 4 | 16.1 (1131) | 30.8 (517) | 9.7 (614) | |
| 5 | 21.5 (1454) | 32.0 (495) | 16.9 (959) | |
| 6 | 20.4 (1461) | 19.0 (315) | 21.0 (1146) | |
| 7 | 21.3 (1558) | 13.6 (208) | 24.7 (1350) | |
| 8 | 20.7 (1547) | 4.7 (69) | 27.7 (1478) | |
| 4 to 5 | 37.6 (2585) | 62.7 (1012) | 26.6 (1573) | <.001 |
| 6 to 8 | 62.4 (4566) | 37.3 (592) | 73.4 (3974) | |
| Weight, lb | <.001 | |||
| <40 | 9.5 (625) | 18.6 (296) | 5.5 (329) | |
| 40–59 | 56.4 (3829) | 66.9 (1064) | 51.8 (2765) | |
| 60–79 | 22.0 (1653) | 11.6 (192) | 26.5 (1461) | |
| ≥80+ | 7.8 (601) | 1.7 (27) | 10.5 (574) | |
| Unknown | 4.3 (443) | 1.1 (25) | 5.7 (418) | |
| Seating position | <.001 | |||
| Left outboard | 41.7 (2916) | 47.3 (747) | 39.3 (2169) | |
| Center | 14.1 (1148) | 5.4 (96) | 17.9 (1052) | |
| Right outboard | 44.2 (3087) | 47.3 (761) | 42.8 (2326) | |
| Driver characteristics | ||||
| Age <25 y | 5.0 (455) | 5.5 (93) | 4.7 (362) | .370 |
| Male gender | 26.8 (1957) | 24.2 (411) | 27.9 (1546) | .032 |
| Restrained | 97.1 (6898) | 97.9 (1561) | 96.7 (5337) | .070 |
| Parent | 81.0 (5721) | 87.1 (1394) | 78.4 (4327) | <.001 |
↵a P values between BPB seat and seat belt groups where applicable. For categorical (nondichotomous) variables, the P values refer to the differences in the distribution of the variables between the BPB seat and seat belt groups.