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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