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

Journal of Patient-Reported Outcomes

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

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