A Korean version of the Oral Impacts on Daily Performances (OIDP) scale in elderly populations: Validity, reliability and prevalence

Table 5 Reliability analysis of OIDP index: Corrected item-total correlation, Cronbach's Alpha, Standardised Alpha and Alpha if item deleted

Performances	Corrected item-total correlation	Alpha if item deleted
1. eating	0.57	0.83
2. speaking	0.57	0.83
3. smiling	0.51	0.83
4. light physical activities	0.58	0.83
5. daily activities	0.67	0.82
6. enjoying contact	0.68	0.82
7. cleaning teeth	0.40	0.84
8. sleeping	0.41	0.84
9. relaxing	0.48	0.84
10. emotional stability	0.68	0.81
Alpha	= 0.84
Standardised item Alpha	= 0.85

ISSN: 1477-7525