Table 3.

Psychometric Testing of Instruments used to Measure Functional Status in Older Adults Transitioning from Hospital to Home

Instrument	Reliability			Validity
	Inter-rater (κ or r)	Test-retest (ICC or r)	Internal Consistency (α)	Construct (CR or CS)	Predictive	Convergent (r)	Divergent
Katz ADL	0.721			0.74 – 0.882	living at home, mortality2
Modified Katz-1	0.27 – 0.636		0.873	0.68 – 0.923	survival, independence after discharge5	0.784
Modified Katz-2			0.917
Barthel index	0.23 – 0.958,9,10,11,14,15, 16,17		0.9013			.64–112,13
Modified Barthel-Shah	0.10 – 0.9514,19		0.9018
Modified Barthel-Granger					discharge to home, length of stay20
Lawton IADL	0.85 – 0.9921,23	0.9323	0.837	0.93 – 0.9621	mental status, psychosocial function, living situation, # of medications, outpatient visits 22	0.36 – 0.7721
ADL Summary Scale		0.82 – 0.9324	0.72 – 0.9524,25	Related to actual functional changes and other health events24	hospitalization, nursing home admission, death24

Note: κ = Kappa statistic, r = correlation, ICC = Intra-class correlation, α = Cronbach’s alpha, CR = coefficient of reproducibility, CS = coefficient of scalability

¹(Rubenstein et al., 1984)

²(Brorsson and Asberg, 1984)

³(Ciesla et al., 1993)

⁴(Mahoney et al., 1999)

⁵(Covinsky et al., 2000)

⁶(Sager et al., 1992)

⁷(Huang et al., 2013)

⁸(Collin et al., 1988)

⁹(Hartigan and O’Mahony, 2011)

¹⁰(Della Pietra et al., 2011)

¹¹(Ranhoff and Laake, 1993)

¹²(Gosman-Hedström and Svensson, 2000)

¹³(Minosso et al., 2010)

¹⁴(Fricke and Unsworth, 1997)

¹⁵(Roy et al., 1988)

¹⁶(Yeo et al., 1995)

¹⁷(Richards et al., 2000)

¹⁸(Shah et al., 1989)

¹⁹(Sinoff and Ore, 1997)

²⁰(Granger et al., 1979)

²¹(Lawton and Brody, 1969)

²²(Vittengl et al., 2006)

²³(Edwards, 1990)

²⁴(Ostir et al., 2001)

²⁵(Volpato et al., 2011).