Presentation of Symptoms at Baseline*
Symptoms Norris+ 1983 Percent Radanov+ 1991 Percent Hildingsson 1990 Percent
Neck pain 100 100 88
Neck stiffness 69
Headache 66 57 54
Shoulder pain 42 40
Arm pain/numb 14
Paresthesias 62 13
Weakness 18
Dysphagia 16
Visual 8 21 9
Auditory 18 4
Dizziness 25 17 23

* Baseline in various studies:
Norris and Watt73 cannot be determined
Radanov et al 82 mean approximately 7 days, s.d. approximately 4 days
Hildingsson and Toolanen 39 less than 3 days
+ Secondary analysis