Table 3.

Internal consistency for OHIP-Sp and its 7 domains

Dimensions	Cronbach's α	One-sided 95% confidence interval for α	Average inter-item correlation
Functional limitation	0.58	0.57	0.13
Physical pain	0.67	0.66	0.19
Psychological discomfort	0.48	0.47	0.16
Physical disability	0.63	0.62	0.16
Psychological disability	0.76	0.75	0.34
Social disability	0.68	0.67	0.30
Handicap	0.65	0.64	0.24
OHIP-Sp total score	0.90	0.90	0.16