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Table 9 Phase three day 1 14 item OACS 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

OACS Item

Corrected Item to Total Correlation

Cronbach’s Alpha

  

.95

1. Your ability to stand compared to before the operation?

.778

 

4. Your ability to walk compared to before the operation?

.849

 

5. Your ability to walk up stairs compared to before the operation?

.829

 

6. Your ability to walk down stairs compared to before the operation?

.819

 

7. Your strength compared to before the operation?

.714

 

8. How comfortable you feel when sitting compared to before the operation?

.742

 

10. Your pain in the affected area compared to before the operation?

.801

 

9. Your pain in the affected area when walking compared to before the operation?

.784

 

15. Your appetite compared to before the operation?

.597

 

16. Your mood compared to before the operation?

.676

 

17. Your energy level compared to before the operation?

.769

 

18. Your sleep compared to before the operation?

.661

 

19. How you feel overall compared to before the operation?

.810

 

20. Your pain when trying to sleep compared to before the operation?

.756

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