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Table 5 Factors associated with total wait time in hip and knee replacement surgery

From: A single-entry model and wait time for hip and knee replacement in eastern health region of Newfoundland and Labrador 2011–2019

Variables

Hip replacement surgery (n = 806)

Knee replacement surgery (n = 1153)

Unadjusted Hazard Ratios

Adjusted Hazard Ratiosa

Unadjusted Hazard Ratios

Adjusted Hazard Ratiosa

HR

95% CI

p

HR

95% CI

p

HR

95% CI

p

HR

95% CI

p

Age group*TW

        

0.0227

   

TW = 0 day

  

0.0190*

  

0.0079*

     

0.0011*

  < 65

0.846

0.736–0.973

 

0.822

0.712–0.950

 

0.604

0.492–0.741

 

0.819

0.726–0.923

 

  ≥ 65

            

TW = 182 days

            

  < 65

      

0.661

0.570–0.767

    

  ≥ 65

            

Diagnosis

  

0.1557

  

0.0097

  

0.0002

  

0.1505

 Osteoarthritis

0.854

0.687–1.062

 

0.740

0.589–0.930

 

1.416

1.178–1.701

 

1.150

0.951–1.390

 

 Others

            

Patient’s preference

  

0.4225

  

0.4708

  

0.0695

  

0.2613

 Next available

0.939

0.805–1.095

 

0.944

0.808–1.103

 

0.892

0.789–1.009

 

1.075

0.948–1.220

 

 Specific surgeon

            

Initial referral form

  

0.3130

  

0.0606

  

0.0390

  

0.6993

 Incomplete

1.200

0.842–1.711

 

1.417

0.985–2.038

 

0.772

0.604–0.987

 

0.951

0.739–1.225

 

 Complete

            

Year of referralb*TW

        

0.0002

  

<.0001

TW = 0 day

  

<.0001**

  

<.0001**

      

 2011–2013

0.410

0.340–0.495

 

0.412

0.340–0.500

 

0.416

0.288–0.600

 

0.582

0.398–0.850

 

 2014–2016

0.502

0.424–0.595

 

0.519

0.437–0.616

 

0.336

0.235–0.480

 

0.331

0.230–0.475

 

 2017–2019

            

TW = 182 days

            

 2011–2013

      

0.326

0.267–0.397

 

0.421

0.342–0.519

 

 2014–2016

      

0.341

0.284–0.411

 

0.351

0.291–0.424

 

 2017–2019

            

Priority*TW

  

0.0010

  

0.0023

  

<.0001

  

<.0001

TW = 0 day

            

 P1

3.412

2.163–5.382

 

2.999

1.889–4.763

 

5.628

3.696–8.570

 

5.166

3.364–7.934

 

 P2

2.239

1.484–3.377

 

1.793

1.179–2.728

 

3.539

2.707–4.625

 

3.221

2.416–4.294

 

 P3

            

TW = 272 days

            

 P1

2.315

1.684–3.181

 

2.112

1.524–2.927

 

3.749

2.824–4.978

 

3.423

2.566–4.565

 

 P2

1.918

1.428–2.577

 

1.615

1.194–2.185

 

2.723

2.230–3.324

 

2.298

1.860–2.839

 

 P3

            
  1. aExtended Cox proportional hazard model adjusted for age group, diagnosis, patient’s preference, initial referral form, year of referral, priority, and their interaction with time, where applicable
  2. bThe year when a patient was referred to the OCI for a hip or knee replacement surgery assessment
  3. * p-value for age group
  4. ** p-value for year of referral