Validation of the English version of the arrhythmia-specific questionnaire in tachycardia and arrhythmia (ASTA): a Rasch evaluation study

Journal of Patient-Reported Outcomes

Table 3 Global fit statistics and reliability for the ASTA Symptom scale and ASTA Heath-Related Quality of Life scale

	ASTA symptom scale	ASTA HRQoL scale
Items
Location, mean	0.00	0.00
Location, SD	0.82	0.45
Fit residual, mean	− 0.29	− 0.30
Fit residual, SD	1.76	1.88
Persons
Location, mean	− 1.16	− 1.60
Location, SD	1.19	1.31
Fit residual, mean	− 0.26	− 0.27
Fit residual, SD	0.89	1.02
Total item trait interaction
Total item χ²	63.25	110.73
df	36	52
p value	0.003	< 0.001
Person separation index	0.75	0.77
Ordinal alpha	0.86	0.92
Cronbach’s alpha	0.81	0.88

ASTA Arrhythmia-Specific questionnaire in Tachycardia and Arrhythmia, HRQoL Health-Related Quality of Life