Fig 1.
Administered by an investigator in which subjects rank the symptoms on a 0–6 scale with 0 meaning “none” and 6 meaning “severe.”
Fig 2.
Dizziness Handicap Index (DHI).
Self-administered and well normed device in which subjects ranked dizziness symptoms as always, sometimes, or never. By assigned 4 for each always, 2 for each sometimes, and 0 for each never a final ordinal score is obtained.
Fig 3.
Self-administered pattern test going from numbers to corresponding letters in the alphabet as follows: 1→A→2→B→…→12→L→13. The pencil may not leave the paper during the test. Time to complete the tracing is recorded.
Table 1.
Group mean and standard deviation of symptom scores.
Table 2.
Principal component loading of symptom scores.
Fig 4.
Cumulative distribution scores for controls (gray) and mTBI subjects (black).
Fig 5.
Cumulative distribution scores analyzed by sex of subject. Gray squares (female controls) and gray diamond (male controls) show on difference across symptoms clusters whereas the black squares (female mTBI) and black diamonds (male mTBI) vary across the dizziness/cognitive and headache/migraine clusters.
Table 3.
Symptoms Cluster Factor Dimensions.