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Table 8 Trends in reliability (Cronbach’s alpha)

From: Evaluation of data quality of interRAI assessments in home and community care

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)
  1. 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