Table 3.

Ordinal Scales

Battery	Components	Scoring	Psychometrics
Performance-Oriented Mobility Assessment (POMA)	Balance subscale = 9 items	Range: 0 – 28	Reliability: Pearson r =0.85
	Gait subscale = 8 items	≤ 18 - High fall risk	Validity: r = 0.91 (vs BBS)
	Takes ~10 mins to complete	≥ 25 - Low fall risk
Mini-BESTest	Fourteen items	Item score: 0 – 2	Test-retest reliability ICC = 0.96
	Takes 10 – 15 mins to complete		Inter-rater reliability ICC = 0.98
			Convergent reliability = r = 0.85 (vs. BBS)
Berg Balance Scale (BBS)	Task performance = 7 items	Range: 0 – 56	Reliability: kappa coefficient = 0.98
	Posture maintenance= 7 items	≤ 20- High fall risk	Validity: r = 0.91 (vs POMA)
	Takes ~20 mins to complete	21 – 40- Moderate fall risk	Internal consistency: Cronbach α = 0.96
		> 40 - Low fall risk
Brunel Balance	Hierarchy of 12 items Takes ~10 mins to complete	Pass/fail at each level Patient progresses to next level until failure	Coefficient of reproducibility1= 0.99 Assessment Coefficient of scalability (subjects)2 = 0.88 (BBA) Coefficient of scalability (items)2= 0.69 Item-Total Correlation = 0.34 – 0.84 Internal consistency: Cronbach α = 0.92 Reliability (kappa coefficient) = 1.0 Validity (Spearman rho; vs BBS) = 0.97

¹coefficient of reproducibility is the likelihood that the patient will fail all the items following the final item passed and pass all the items preceding it.

²coefficient of scalability is the proportion of scaling errors to “maximum errors”. Maximum errors are extreme scores - the number of subjects who pass or fall all items or the number of items passed or failed by all subjects.

Both coefficients and the step-wise negative correlation between pass rate and task difficulty are measures of hierarchy.