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Table 7 Phase three day 1 14 item OARS item to total correlations and internal reliability

From: Development of a patient-reported outcome measure (PROM) and change measure for use in early recovery following hip or knee replacement

Domain Item Corrected Item to Total Correlation Cronbach’s Alpha
Pain    .74
  3. I’ve felt tired .434  
  5. It’s been painful in the affected area .647  
  7. I’ve had pain at night in the affected area .629  
  8. The affected area has felt swollen .459  
Nausea and feeling unwell    .78
  1. I’ve felt unwell .586  
  4. I’ve felt faint .561  
  15. I’ve felt sick .695  
  18. I’ve lost my appetite .499  
Fatigue and sleep    .89
  12. I’ve not slept well .853  
  13. I’ve found it difficult to sleep .829  
  14. I’ve not been able to sleep due to the pain in the affected area .699  
Increasing function and mobility    .79
  9. I’ve had difficulty getting into bed .501  
  10. I’ve not been able to stand .776  
  11. I’ve not been able to walk .659  
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