Skip to main content

Advertisement

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.