Table 8.

Trends in reliability (Cronbach’s alpha)

year	IADL (perf)			IADL (cap)			DRS			ADL – Long Form
	ON HC	BC HC	CHA	ON HC	BC HC	CHA	ON HC	BC HC	CHA	ON HC	BC HC	CHA
2003	0.87			0.87			0.74			0.92
2004	0.87			0.87			0.73			0.93
2005	0.87			0.87			0.73			0.93
2006	0.87			0.87			0.72			0.93
2007	0.87			0.87			0.72			0.93
2008	0.87	0.89		0.87	0.87		0.72	0.76		0.93	0.93
2009	0.87	0.89		0.87	0.87		0.72	0.74		0.93	0.93
2010	0.87	0.88		0.87	0.86		0.72	0.75		0.92	0.93
2011	0.87	0.88		0.87	0.87		0.72	0.74		0.92	0.93
2012	0.87	0.88		0.86	0.86		0.73	0.74		0.92	0.94
2013	0.87	0.88	0.83	0.85	0.87	0.88	0.73	0.75	0.76	0.92	0.93	0.93
2014	0.86	0.88	0.82	0.85	0.86	0.87	0.72	0.75	0.76	0.92	0.93	0.93
2015			0.82			0.86			0.74			0.92
2016			0.82			0.86			0.73			0.93
Mean (SD) of annual alpha values	0.87 (0.00)	0.88 (0.00)	0.82 (0.01)	0.87 (0.01)	0.87 (0.01)	0.87 (0.01)	0.73 (0.01)	0.75 (0.01)	0.75 (0.02)	0.93 (0.01)	0.93 (0.00)	0.93 (0.01)

ADLH Activities of Daily Living – Long Form scale, BC HC British Columbia RAI-HC data from the Home Care Reporting System, CHA Community Health Assessments from Ontario, CPS Cognitive Performance Scale, DRS Depression Rating Scale, IADL cap Instrumental Activities of Daily Living scale, IADL perf Instrumental Activities of Daily Living self-performance scale, ON HC Ontario RAI-HC data from the Ontario Association of Community Care Access Centres