Percent prevalence of symptoms initially and at final follow-up (adapted from Norris and Watt73)
Group 1 (n=27) Group 2 (n=24) Group 3 (n=10)
Initial F/U Initial F/U Initial F/U
Neck pain 100 44 100 81 100 90
Headache 48 37 78 37 80 70
Dysphagia 19 0 10 0 30 0
Paresthesias 33 37 43 29 100 60
Weakness 15 0 10 0 50 0
Visual symptoms 8 19 0 10 30 10
Auditory symptoms 8 11 0 14 30 20
Dizziness 0 0 5 0 10 0

Adapted from Norris and Watt. 73
F/U = follow-up.