Alternative Risk-Adjustment Approaches to Assessing the Quality of Home Health Care: Final Report. TABLE 7a: Summary of Regression Models: Instruments Activities of Daily Living

07/01/2006

TABLE 7a. Summary of Regression Models: Instrumental Activities of Daily Living
  Risk-Adjusted in OBQI or HHQI University of Colorado Model Model 1 Clinical Core (Baseline Model) Model 2 Adds Outcome-Specific Model 3 Adds OASIS “Prior” Items
IMPROVEMENT IN HOUSINGKEEPING Yes  
Percent Who Could Improve: 68.6%
Percent Improving Among Those Who Could: 44.2%
Number of OASIS Items   48 41 43 46a
Number of OASIS Elements   74 59 65 70
R2 statistic   0.263 0.254 0.254 0.273
c statistic   0.798 0.792 0.793 0.803
IMPROVEMENT IN LAUNDRY Yes  
Percent Who Could Improve: 67.6%
Percent Improving Among Those Who Could: 37.1%
Number of OASIS Items   47 41 43 46b
Number of OASIS Elements   76 59 65 70
R2 statistic   0.264 0.220 0.221 0.246
c statistic   0.805 0.779 0.779 0.794
IMPROVEMENT IN SHOPPING Yes  
Percent Who Could Improve: 69.3%
Percent Improving Among Those Who Could: 47.1%
Number of OASIS Items   46 41 43 46c
Number of OASIS Elements   64 59 65 70
R2 statistic   0.226 0.204 0.204 0.222
c statistic   0.775 0.759 0.760 0.772
IMPROVEMENT IN LIGHT MEAL PREPARATION Yes  
Percent Who Could Improve: 50.9%
Percent Improving Among Those Who Could: 52.4%
Number of OASIS Items   51 41 41 44d
Number of OASIS Elements   79 59 61 66
R2 statistic   0.267 0.215 0.216 0.236
c statistic   0.797 0.766 0.767 0.779
IMPROVEMENT IN TELEPHONE USE Yes  
Percent Who Could Improve: 18.1%
Percent Improving Among Those Who Could: 47.1%
Number of OASIS Items   70 41 41 44e
Number of OASIS Elements   97 59 61 66
R2 statistic   0.124 0.106 0.106 0.116
c statistic   0.702 0.686 0.687 0.695
IMPROVEMENT IN MEDICATION MANAGEMENT Yes  
Percent Who Could Improve: 38.7%
Percent Improving Among Those Who Could: 34.8%
Number of OASIS Items   48 41 41 44f
Number of OASIS Elements   76 59 61 66
R2 statistic   0.180 0.132 0.133 0.157
c statistic   0.754 0.718 0.720 0.737
STABILIZATION IN HOUSEKEEPING Yes  
Percent Who Could Stabilize: 31.3%
Percent Stabilized Among Those Who Could: 82.3%
Number of OASIS Items   50 41 43 46a
Number of OASIS Elements   71 59 65 70
R2 statistic   0.110 0.088 0.089 0.095
c statistic   0.721 0.699 0.699 0.706
STABILIZATION IN LAUNDRY Yes  
Percent Who Could Stabilize: 17.2%
Percent Stabilized Among Those Who Could: 83.1%
Number of OASIS Items   46 41 43 46b
Number of OASIS Elements   68 59 65 70
R2 statistic   0.133 0.114 0.115 0.120
c statistic   0.752 0.732 0.732 0.739
STABILIZATION IN SHOPPING Yes  
Percent Who Could Stabilize: 44.1%
Percent Stabilized Among Those Who Could: 89.2%
Number of OASIS Items   41 41 43 46c
Number of OASIS Elements   56 59 65 70
R2 statistic   0.120 0.109 0.109 0.116
c statistic   0.776 0.761 0.762 0.771
STABILIZATION IN LIGHT MEAL PREPARATION Yes  
Percent Who Could Stabilize: 44.3%
Percent Stabilized Among Those Who Could: 90.1%
Number of OASIS Items   43 41 41 44d
Number of OASIS Elements   69 59 61 66
R2 statistic   0.118 0.086 0.086 0.091
c statistic   0.777 0.735 0.736 0.742
STABILIZATION IN TELEPHONE USE Yes  
Percent Who Could Stabilize: 66.7%
Percent Stabilized Among Those Who Could: 92.6%
Number of OASIS Items   45 41 41 44e
Number of OASIS Elements   66 59 61 66
R2 statistic   0.103 0.091 0.092 0.092
c statistic   0.803 0.788 0.788 0.789
STABILIZATION IN MEDICATION MANAGEMENT No  
Percent Who Could Stabilize: 54.8%
Percent Stabilized Among Those Who Could: 91.7%
Number of OASIS Items   N/A 41 41 44f
Number of OASIS Elements     59 61 66
R2 statistic     0.064 0.064 0.066
c statistic     0.728 0.728 0.732
NOTES: “Percent Who Could Improve” calculated using all home health episodes, not just those discharged to the community. The smallest sample size for the IADL risk-adjustment models is 42,946. Shading indicates that CO model statistics are for multiple sub-models; we report the number of unique OASIS items and elements across all sub-models.
  1. Risk-adjustment model includes help required with housekeeping, impaired decision making and memory loss prior to home health admission.
  2. Risk-adjustment model includes help required with laundry, impaired decision making, and memory loss prior to home health admission.
  3. Risk-adjustment model includes help required with shopping, impaired decision making, and memory loss prior to home health admission.
  4. Risk-adjustment model includes help required with light meal preparation, impaired decision making and memory loss prior to home health admission.
  5. Risk-adjustment model includes help required with telephone use, impaired decision making, and memory loss prior to home health admission.
  6. Risk-adjustment model includes help required with taking oral medication(s), impaired decision making and memory loss prior to home health admission.

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