TABLE 1.

Factor matrix for exploratory factor analysis model restricted to a single factor and applied to the core set of 19 questions. Blanks correspond to loadings less than 0.4

Question number	Core model
	Factor 1
Q2	0.457
Q6	0.518
Q7	0.708
Q8	0.530
Q9	0.577
Q10	0.609
Q11	0.613
Q12	0.761
Q13	0.736
Q14	0.779
Q15	0.705
Q16	0.787
Q49	0.644
Q52	0.534
Q54	0.697
Q55	0.439
Q56	0.670
Q58
Q59	0.742