Percent prevalence of initial characteristics of subjects asymptomatic and symptomatic at follow-up (adapted from Radanov et al82)
SymptomaticAsymptomatic
(n=21)(n=57)
Headache7152
Shoulder pain5737
Blurred vision3316
Dizziness2414
Finger paresthesias297
Fatigue*6854
Sleep disturbances*6526
Sensitivity to noise*3828
Irritability*3816
Forgetfulness*257

Initial prevalence of self-reported neck pain, back pain, difficulty swallowing, and anxiety not different in the two groups.
*Self-report on interview