UK population norms for the modified dental anxiety scale with percentile calculator: adult dental health survey 2009 results

Table 1 Psychometric details: item means (sd); factor loadings, maximum likelihood (ML), asymptotic distribution free (ADF), pearson correlation matrix and item wording

Items	Mean	Sd	Factor loadings
			ML	ADF
Q1	1.91	1.22	.94	.93
Q2	1.98	1.26	.97	.97
Q3	2.61	1.42	.79	.79
Q4	1.69	1.09	.67	.67
Q5	2.55	1.43	.66	.66
*Items*	*Correlations*
	Q1	Q2	Q3	Q4	Q5
Q1	1	.91	.74	.64	.62
Q2		1	.77	.65	.65
Q3			1	.62	.76
Q4				1	.55
Q5					1
*Items*	*Wording*
Q1	If you went to the dentist for TREATMENT TOMORROW, how would you feel?
Q2	If you were sitting in the WAITING ROOM (waiting for treatment), how would you feel?
Q3	If you were about to have a TOOTH DRILLED, how would you feel?
Q4	If you were about to have your TEETH SCALED AND POLISHED, how would you feel?
Q5	If you were about to have a LOCAL ANAESTHETIC INJECTION in your gum above an upper back tooth, how would you feel?

Cronbach’s alpha (95% CIs): 0.917 (0.915, 0.919).
Confirmatory Factor Analysis ‘closeness of fit’ estimates for unidimensional scale (ADF estimation):
chi-square = 19.28.
degrees of freedom = 2.
CFI = 0.998, (greater than 0.95).
TLI = 0.990, (greater than 0.95).
RMSEA (95% CIs) = 0.028 (0.017, 0.041) (less than 0.05).

ISSN: 1472-6831