Table 2.

Internal consistency measured for the total OHIP-NL and for its seven domains: Cronbach's alphas and average inter-item correlations

	Cronbach's alpha	Average inter-item correlation
Total OHIP-NL	0.97	0.42
Functional limitation	0.82	0.34
Physical discomfort	0.87	0.42
Psychological discomfort	0.90	0.64
Physical disability	0.88	0.54
Psychological disability	0.92	0.66
Social disability	0.95	0.79
Handicap	0.92	0.65