Patient self-report section of the ASES questionnaire: a Spanish validation study using classical test theory and the Rasch model

Table 2 Confirmatory factor analyses results and item-scale total correlations

Item no.	Description	All ASES-p items (n = 106)	Function items^b (n = 112)	Item-total correlation
Pain^a
Item	How bad is your pain today	0.62	-	0.60
Function
Item 1	Put on a coat	0.83	0.79	0.66
Item 2	Sleep on painful/affected side	0.73	0.75	0.58
Item 3	Wash back/do up bra in back	0.79	0.79	0.60
Item 4	Manage toileting	0.69	0.74	0.52
Item 5	Comb hair	0.82	0.82	0.65
Item 6	Reach high shelf	0.89	0.87	0.73
Item 7	Lift 10 lbs. above shoulder	0.84	0.85	0.62
Item 8	Throw a ball overhand	0.88	0.86	0.70
Item 9	Do usual work	0.83	0.81	0.66
Item 10	Do usual sport	0.53	0.57	0.40
Diagnostics
χ ² ; df		59.476; 44	61.507; 34
RMSEA (90% CI)		0.058 (0.00–0.092)	0.085 (0.050–0.118)
p-value RMSEA		0.349	0.052
TLI; CFI		0.942; 0.954	0.981; 0.975

df degrees of freedom, RMSEA root mean square error of approximation, CI confidence interval, TLI Tucker-Lewis index, CFI comparative fit index
^aThe Pain item was implemented in a reversed form, with values ranging from 0 = maximum intensity pain to 10 = no pain at all. ^bIn this model, based on a modification index of 11.55 (residual correlation = 0.19) a correlation between items 9 & 10 was allowed (loading = 0.44). Confirmatory factor analysis results and correlations were based on available ASES-p item with full data. Item-total scale correlations were explored with Spearman’s correlation coefficient and were controlled for overlapping

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