Mean values or percentages of variables that differed significantly in the motor vehicle accident sub-group compared with the remaining cohort at baseline (n = 187).
| Variable | MVA sub-group (n = 42) | Remaining cohort (n = 145) | P-value |
|---|---|---|---|
| Mean age, years | 34.8 | 41.5 | 0.007 |
| On sick leave, % | 36 | 26 | 0.037 |
| Had previous neck pain periods, % | 45 | 65 | 0.015 |
| Duration of neck pain <2 weeks, % | 58 | 44 | 0.185a |
| Additional headache, % | 86 | 56 | 0.001 |
| Pain in the upper part of the neck, % | 41 | 46 | 0.120a |
| Mean score on the NRS | 6.3 | 6.5 | 0.520a |
| Severe acute onset of the pain, % | 42 | 57 | 0.758a |
| Mean NDI total score | 16.6 | 13.7 | 0.018 |
↵a non-significant. MVA = motor vehicle accident. NDI = neck disability index. NRS = numerical pain-rating scale.