Characteristics of the cohort
| Characteristic (number missing data) | Respondents, n (%) | Non-respondents, n (%) | p Value |
|---|---|---|---|
| *χ2; †Mann Whitney U. | |||
| BMI, body mass index; SD, standard deviation. | |||
| Total | 503 (44%) | 644 (56%) | |
| Female | 332 (66%) | 352 (55%) | <0.005* |
| Age, median (IQ range) | 43 (31–55) | 34.5 (24–45) | <0.005† |
| BMI, median (range) | 25.7 (16.2–43.7) | ||
| Previous neck pain | 89 (17.7%) | ||
| Current smoker (7) | 101 (20.1%) | ||
| Married | 362 (72%) | ||
| Occupation (17) | |||
| Unemployed or housewife | 44 (8.7%) | ||
| Unskilled | 120 (23.9%) | ||
| Semi-skilled | 185 (36.8%) | ||
| Skilled | 61 (15.1%) | ||
| Professional or managerial | 76 (15.1%) | ||
| Visited casualty | 330 (65.6%) | ||
| Visited GP | 364 (72.4%) | ||
| Car size (4) | |||
| Mini | 173 (34.7%) | ||
| Small | 174 (34.9%) | ||
| Large | 152 (30.5%) | ||
| Headrest present | 460 (91.5%) | ||
| Correct headrest position (111) | 197 (39.2%) | ||
| Aware of collision | 121 (24.1%) | ||
| Head turned | 156 (31%) | ||
| Struck car driveable | 314 (62.4%) | ||
| Striking car driveable | 310 (61.6%) | ||
| Struck car stationary | 399 (79.3%) | ||
| Striking speed, mph (23), mean (SD) | 28.8 (12.1) | ||