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Table 3 Correlation matrix showing inter-relationships between the examined predictors, global outcome and satisfaction

From: The role of patient expectations in predicting outcome after total knee arthroplasty

 

Gender (male 0, female 1)

Age

Other joint problems (no 1, yes 2)

ASA score (co-morbidity)

Pain pre operationa

Functional limitations pre operationa

Expectations about paina

Expectations about functional limitationsa

Expectations about recovery time

Pain at 2 yearsa

Functional limitations at 2 yearsa

Change in pain, pre operation to 2 yearsa

Change in functional limitations, pre operation to 2 yearsa

Expectations fulfilled, painb

Expectations fulfilled, functional limitationsb

Global treatment outcomec

Gender (male 0, female 1)

1.000

               

Age

0.073

1.000

              

Other joint problems (no 1, yes 2)

-0.089

-0.163

1.000

             

ASA score (co-morbidity)

0.025

0.388**

0.224*

1.000

            

Pain pre operationa

0.021

0.055

-0.111

0.010

1.000

           

Functional limitations pre operationa

0.044

-0.020

-0.010

-0.169

0.218

1.000

          

Expectations about paina

0.000

-0.240*

0.077

-0.026

0.019

0.096

1.000

         

Expectations about functional limitationsa

-0.271*

-0.004

0.146

0.176

0.117

0.010

0.255*

1.000

        

Expectations about recovery time

-0.014

-0.292**

0.179

-0.181

0.062

-0.100

0.136

0.030

1.000

       

Pain at 2 yearsa

-0.053

-0.288**

0.231*

0.089

0.221*

0.055

0.312**

0.303**

0.175

1.000

      

Functional limitations at 2 yearsa

-0.131

-0.143

0.163

0.110

0.349**

0.267*

0.342**

0.492**

0.020

0.389**

1.000

     

Change in pain, pre operation to 2 yearsb

0.035

0.335**

-0.288**

-0.048

0.420**

0.083

-0.318**

-0.198

-0.171

-0.765**

-0.158

1.000

    

Change in functional limitations, pre to 2yb

0.154

0.133

-0.138

-0.204

-0.231*

0.344**

-0.293**

-0.469**

-0.073

-0.325**

-0.791**

0.171

1.000

   

Expectations fulfilled, painb

0.045

0.226*

-0.236*

-0.091

-0.253*

-0.017

0.023

-0.225*

-0.140

-0.930**

-0.291**

0.678**

0.248*

1.000

  

Expectations fulfilled, functional limitationsb

-0.044

0.146

-0.090

-0.052

-0.326**

-0.256*

-0.183

0.059

-0.009

-0.261*

-0.818**

0.065

0.618**

0.230*

1.000

 

Global treatment outcomec

0.007

-0.111

0.302**

0.032

0.041

0.085

0.236*

0.237*

0.150

0.405**

0.384**

-0.389**

-0.262*

-0.355**

-0.255*

1.000

Satisfactionc

-0.014

-0.154

0.323**

0.100

0.010

0.036

0.274*

0.262*

0.102

0.567**

0.264*

-0.543**

-0.194

-0.498**

-0.094

0.800**

  1. Data in bold are significant: *P < 0.05 (two-tailed), **P < 0.01 (two-tailed). n = 80 patients (listwise exclusion of missing data, and excluding patients (n = 13) that underwent further surgery on the index knee). ASA, American Association of Anaesthesiologists. aHigher value = more pain (or expect more pain) or greater functional limitations (or expect greater functional limitations). bHigher value = better outcome (greater change in pain or functional limitations, greater fulfilment of expectations). cHigher value = worse outcome, or lower satisfaction.