TABLE 2.

Two‐by‐two contingency tables for the proportional association between Romberg test condition 4 performance and FoG Status

FoG status	No failure during Romberg condition 4	Failure during Romberg condition 4	Total
No FoG	57	22	79
FoG	2 a	11 b	13
Total	59	33	92

Contingency table of FoG versus Romberg test condition 4 performance status in PD (likelihood ratio χ² = 15.6; P < 0.0001).

^a FoG was present in 3.3% of subjects with PD without failure during Romberg condition 4.

^b Failure during Romberg condition 4 was present in 84.6% of subjects with PD with FoG.

FoG, freezing of gait; PD, Parkinson's disease.