A generic outcome assessment of mobility capacity in neurorehabilitation: measurement properties of the de Morton Mobility Index

Table 1 Construct validity of the de Morton Mobility Index (n = 348) including the hypotheses on construct validity and the constructs of the comparison measurement instruments

No	Hypothesis	Comparison measurement instrument			Observed correlation with DEMMI (Spearman’s correlation)		Hypothesis confirmed
No	Hypothesis	Measurement instrument	Construct	Mean ± SD (range) or median (IQR)	rho	95% CI	Hypothesis confirmed
1	A correlation of > 0.7 was expected between the DEMMI and other measures of mobility and functional independence	POMA, 0–28 points	Mobility	18 ± 10 (0–28)	0.94	0.93 to 0.95	Yes
2		Timed Up and Go test (n = 266), sec^a	Mobility	14 ± 11 (4–76)	0.80	0.75 to 0.84	Yes
3		10-m gait speed, fast (n = 277), m/sec	Mobility	1.15 ± 0.51 (0.11–2.00)	0.75	0.69 to 0.80	Yes
4		FIM mobility sub-scale (n = 325), 5–35 points	Mobility	23 ± 8 (5–35)	0.80	0.76 to 0.84	Yes
5		FAC, 0–5 points	Ambulation	4 (3–5)	0.89	0.87 to 0.91	Yes
6		6-min walk test (n = 276), meters	Walking endurance	349 ± 161 (28–664)	0.82	0.78 to 0.86	Yes
7		Berg Balance Scale, 0–56 points	Balance	36 ± 19 (0–56)	0.95	0.94 to 0.96	Yes
8		FIM total (n = 325), 18–126 points	Functional independence	86 ± 24 (18–126)	0.73	0.68 to 0.78	Yes

SD standard deviation, IQR interquartile-range, CI confidence interval, DEMMI de Morton Mobility Index, POMA Performance Oriented Mobility Assessment, FIM Functional Independence Measure, FAC Functional Ambulation Categories
^a indicates hypothesis of a negative correlation

ISSN: 1471-2377