Table 2.

Muscle strength as a discriminator between those in the SBMA cohort who were able versus those who were not able to complete each balance test. Strength values are expressed as a percentage of predicted. For clarity, only the right side is presented except for averaged composite strength (lower extremities).

Muscle group	Able to complete (mean ± SD)	N	Not able to complete (mean ± SD)	N	AUC	95% CI
Forward lunge
Lower extremities	0.50 ± 0.17	28	0.43 ± 0.15	15	0.62	0.43-0.81
Knee extension	0.39 ± 0.18	28	0.32 ± 0.21	15	0.67	0.48-0.87
Ankle dorsiflexion	0.47 ± 0.20	28	0.33 ± 0.17	15	0.67	0.49-0.85
Ankle plantarflexion	0.31 ± 0.20	28	0.26 ± 0.17	15	0.60	0.41-0.80
Hip extension	1.03 ± 0.43	28	0.93 ± 0.21	15	0.47	0.29-0.65
Step quick turn
Lower extremities	0.52±0.18	26	0.39±0.11	19	0.75	0.61–0.90
Knee extension	0.44±0.20	26	0.26±0.12	19	0.78	0.64–0.92
Ankle dorsiflexion	0.47±0.20	26	0.36±0.36	19	0.65	0.49–0.82
Ankle plantarflexion	0.34±0.20	26	0.21±0.21	19	0.78	0.64–0.92
Hip extension	1.03±0.43	26	0.92±0.26	19	0.45	0.28–0.63
Step up and over
Lower extremities	0.56 ± 0.15	25	0.35 ± 0.10	15	0.89	0.79–1.00
Knee extension	0.46 ± 0.19	25	0.24 ± 0.10	15	0.89	0.78–1.00
Ankle dorsiflexion	0.47 ± 0.21	25	0.35 ± 0.15	15	0.66	0.48–0.83
Ankle plantarflexion	0.36 ± 0.21	25	0.19 ± 0.15	15	0.87	0.75–0.99
Hip extension	1.10 ± 0.39	25	0.78 ± 0.25	15	0.78	0.64–0.93