| Norris and Watt+, 1983 | Radanov et al.+, 1991 | Radanov et et.**, 1993 | Hildingsson and Toolanen, 1990 | |
| n ( %) | n ( %) | n ( %) | n ( %) | |
| Symptomatic | 21 (27) | 41 (44) | ||
| Neck pain | 40 (66) | 27 (29) | ||
| Neck stiffness | 23 (25) | |||
| Headache | 26 (43) | 32 (27) | 14 (15) | |
| Shoulder pain | 18 (17) | |||
| Arm pain/numb. | 23 (38) | 8 ( 9) | ||
| Paresthesias | 2 ( 3) | |||
| Weakness | 8 (13) | |||
| Dysphagia | 8 (13) | 6 ( 6) | ||
| Visual | 0 ( 0) | 5 ( 5) | ||
| Auditory | 4 ( 4) |
* Time from MVC to follow-up:
Norris and Watt 73 $ 6 months, mean approximately 2 years
Radanov et al 82 ,85 6 months Hildingsson and Toolanen39 6-43 months, mean approximately 2 years
+ Secondary analysis
** Symptom of interest: headache only
