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Table 3 Unadjusted and adjusted associations between expectations and 5 treatment outcomes

From: Systematic review: Do patient expectations influence treatment outcomes in total knee and total hip arthroplasty?

 

Overall improvement

Pain

Function

Stiffness

Satisfaction

 

E1/E2

Association individual studies

Quality score

N

Overall association

E1/E2

Association individual studies

Quality score

N

Overall association

E1/E2

Association individual studies

Quality score

N

Overall association

E1/E2

Association individual studies

Quality score

N

Overall association

E1/E2

Association individual studies

Quality score

N

Overall association

Unadjusted associations

                         

≤ 6 weeks

     

E2

r=−0.08 [36]

53%

100

O

E2

r=−0.05 [36]

53%

100

O

E1

r=0.165 ‡ [16]hips

39%

106

0

E1

OR=1.176 (ns)∫ [31]

61%

45

O

>6 weeks – ≤6 months

E2

r=0.13 [30]

79%

123

O

E1

r=0.118* [16]hips

39%

106

+−

E1

r=0.170[16]hips

39%

106

+−

 

r=−0.024 ‡ [16]knees

39%

106

  

OR=0.593 (ns)# [31]

   
   

r=0.24 [32]

74%

272

  

r=0.188* [16]knees

39%

106

  

r=−0.208[16]knees

39%

106

  

ns [15]

58%

222

 

OR=1.000 (ns)∞ [31]

   
       

p=0.001 [14]

58%

2350

  

p<0.001 [14]

58%

2350

  

p=0.46 [17]

74%

788

      
       

p<0.05 [15]

58%

222

  

ns [15]

58%

222

           
       

p=0.62 [17]

74%

788

  

p=0.90 [17]

74%

788

           
      

E2

r=−0.12 [32]

74%

272

 

E2

r=0.19 [30]

79%

123

O

          
            

r=−0.19 [32]

74%

272

           

> 6 months

E1

r=0.24 [27]

58%

146

+−

E1

p=0.012 [14]

58%

2350

+

E1

r=−0.547 [37]

6%

1302

+−

E1

OR= 1.23 (p<0.001) [34]

63%

1327

+

E1

r=−0.03 [24]

50%

44

+−

  

p=0.70 ∏ [35]

50%

799

  

OR=1.17 (p<0.001) [34]

63%

1327

  

p<0.001 [14]

58%

350

       

r=0.274 ∫[27]

58%

146

 
  

p=0.013 Ω [35]

50%

799

       

p<0.001 [28]

44%

102

       

r=0.262#[27]

58%

146

 
  

OR=1.36 (=0.013) [34]

63%

1327

       

OR=1.25 (p<0.001) [34]

63%

1327

       

r=0.102§ [27]

58%

146

 

Adjusted associations

                     

p=0.171 ∫ [35]

50%

799

 

≤ 6 weeks

E1

β0.23 (p0.10) [33]

68%

51

O

     

E1

β 0.23 (p=0.11) [33]

68%

51

O

      

p=0.013 # [35]

50%

799

 
           

E2

β 0.151 (ns) [36]

53%

100

O

          

>6 weeks – ≤6 months

E1

β-0.107(ns) [25]

58%

78

O

E1

β0.364 (p<.01)* [25]

58%

78

+−

E1

β 0.081 (ns) [25]

58%

78

+−

E1

ns [15]

58%

222

O

     
       

β7.8 (p<.01) [15]

58%

222

  

ns [15]

58%

222

  

ns [17]

74%

788

      
       

ns [17]

74%

788

  

β 8.10 (p<0.01)∞ [15]

58%

222

           
 

E2

β0.09 (ns) [30]

79%

123

0

      

ns § [17]

74%

788

           
  

β-0.193 (ns) [25]

 

78

 

E2

β-0.388 (p<.01)[25]

58%

78

+−

E2

β0.18 [30]

78%

123

+−

          
  

ns [32]

58%

272

  

OR=0.80§ [29]

68%

157

  

β-0.337 (p<0.05) [25]

58%

78

           
   

74%

   

ns [32]

74%

272

  

ns § [29]

68%

157

           
            

ns [32]

74%

272

           

> 6 months

E1

ns [27]

58%

146

+−

E1

p<0.001‡ [14]

58%

2350

+−

E1

p>0.05‡ [14]

58%

2350

+−

E1

OR= 1.21 (p=0.003) [34]

63%

1327

+

E1

ns [26]

53%

598

O

  

OR=1.34 (p = 0.04) [34]

63%

1327

  

p<0.05 [26]

52%

598

  

ns [26]

52%

598

       

ns ∫ [27]

58%

146

 
       

ns [17]

74%

788

  

ns [17]

74%

788

       

ns #[27]

58%

146

 
       

OR=1.14 (p=0.049) [34]

63%

1327

  

OR=1.20 (p<0.001) [34]

63%

1327

       

ns § [27]

58%

146

 
  1. E1 outcome expectations, E2 efficacy expectations, ns= non significant, + positive association between expectations and outcome (the higher the expectations the better the outcome), - negative association between expectations and outcome (the higher the expectations the worse the outcome), O no association between expectations and outcome, +− unclear association between expectations and outcomes, ∏ association between expectations about pain and overall improvement, Ω association between expectations about function and overall improvement *correlation between importance of expectations and WOMAC pain change score between baseline and 6 months after surgery, †correlation between importance of expectations and WOMAC function change score between baseline and 6 months after surgery, correlation between importance of expectations and WOMAC stiffness change score between baseline and 6 months after surgery, ∫ association between expectations about pain and satisfaction, # association between expectations about functional limitations and satisfaction, § association between expectations about recovery time and satisfaction, ∞ association between expectations about overall success and satisfaction.