Oral impact on daily performance (OIDP) scale for use in Sri Lankan adolescents: a cross sectional modification and validation study

Table 4 Reliability analysis: Inter-item correlation for the 8 items of the modified OIDP (n = 220)

Performance Scores	Chewing	Talking	Cleaning	Sleeping	Smiling	Emotion	Activities	Enjoying
Chewing	1.0
Talking	0.50	1.0
Cleaning	0.43	0.62	1.0
Sleeping	0.51	0.54	0.39	1.0
Smiling	0.33	0.62	0.39	0.52	1.0
Emotion	0.42	0.43	0.24	0.60	0.48	1.0
Activities	0.44	0.50	0.36	0.65	0.52	0.72	1.0
Enjoying	0.36	0.40	0.18	0.59	0.41	0.58	0.67	1.0

ISSN: 1472-6831