Table 2.

Reliability statistics for the total score and items in the parental version (n = 159)

	Reliability
	Parental version
	Cronbach’s alpha §	Intraclass correlation coefficient (95% CI) *
Total score	0.90	0.98 (0.97-0.99)
Difficulty eating	0.50	0.92 (0.89-0.94)
Difficulty playing	0.29	0.89 (0.85-0.92)
Difficulty speaking	0.44	0.96 (0.95-0.97)
Avoiding smiling (due to appearance)	0.43	0.93 (0.91-0.95)
Avoiding smiling (due to pain)	0.43	0.96 (0.95-0.97)
Difficulty sleeping	0.50	0.97 (0.96-0.98)
Affected self-confidence	0.42	0.87 (0.82-0.91)

* Two-way random effects model: p < 0.001 for all values;

§ Internal consistency (Cronbach’s alpha) was performed for the total score (7 items together) and item-total correlations.