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Table 4 Results of logistic regression models – factors associated with patients’ willingness to undergo TJR

From: Which disease-related factors influence patients’ and physicians’ willingness to consider joint replacement in hip and knee OA? Results of a questionnaire survey linked to claims data

VariableReferenceOR hip95% CI hipp-Value hipOR knee95% CI kneep-Value knee
Age, yearsper 10-year increment0.9(0.67; 1.19)0.451.09(0.9; 1.31)0.38
Sex, femaleMale0.99(0.53; 1.86)0.980.77(0.5; 1.18)0.22
BMI > =35 kg/m2a< 35 kg/m20.44(0.15; 1.36)0.151(0.53; 1.91)1
Symptom duration, yearsbper 5-year increment1.01(0.86; 1.19)0.91.07(0.99; 1.16)0.09
Deterioration of symptoms over the 2 preceding yearsano change/ improvement2.73(1.14; 6.55)0.023.66(2.05; 6.53)< 0.01
WOMACaper 10-unit increase1.47(1.24; 1.75)< 0.011.42(1.26; 1.61)< 0.01
Any impact on personal lifeaNo impact10.3c(1.04; 103)0.056.81(2.23; 20.79)< 0.01
WHO-5aper 10 units increase0.98(0.86; 1.11)0.720.86(0.79; 0.95)< 0.01
Treatment by orthopaedist aTreatment by other physician2.39(1.04; 5.48)0.041.44(0.84; 2.46)0.18
NSAID prescriptionaNo0.97(0.53; 1.77)0.911.27(0.78; 2.07)0.34
Opioid prescriptionaNo0.9(0.32; 2.54)0.851.83(1.01; 3.34)0.05
Physical therapy prescriptionaNo1.24(0.65; 2.39)0.511.19(0.72; 1.95)0.49
Having at least one artificial jointNo6.01(3; 12.06)< 0.013.69(2.2; 6.18)< 0.01
  1. aadjusted for age, sex, symptom duration
  2. badjusted for age, sex
  3. cThis result is not robust (see confidence interval) since there are only few patients willing for TJR without impact on their personal life
  4. Results of 11 multiple logistic regression models with “patients’ willingness to undergo TJR” as independent variable. Bold numbers indicate statistically significant associations
  5. Multiple imputation (n = 20 imputations) was used to deal with missing values