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 4 Item location, item fit statistics and thresholds for the items in the ASTA Symptom scale and ASTA Health-Related Quality of Life scale

Items^a	Item location	Item fit statistics		Centralized thresholds
Items^a	Item location	Residual^b	p value^c	I	II	III	Reversed
ASTA Symptom Scale
6	− 0.95	− 2.27	0.008	− 1.18	0.54	0.63	No
1	− 0.92	− 0.75	0.599	− 0.86	0.92	− 0.06	Yes
5	− 0.77	− 2.36	0.244	− 1.16	0.81	0.35	Yes
9	− 0.39	2.85	0.046	− 1.34	0.37	− 0.03	Yes
3	0.06	1.39	0.522	− 1.18	0.91	0.27	Yes
2	0.31	− 1.49	0.055	− 0.86	0.56	− 0.69	Yes
4	0.57	0.86	0.194	− 0.06	0.34	− 0.27	Yes
8	0.69	0.28	0.447	− 1.13	0.88	0.24	Yes
7	1.40	− 1.13	0.391	− 1.04	0.62	0.42	Yes
ASTA HRQoL Scale
5	− 0.83	− 2.08	0.007	− 1.36	0.91	0.45	Yes
1	− 0.42	− 2.41	0.152	− 0.86	0.68	0.18	Yes
13	− 0.40	1.90	0.125	− 1.31	0.93	0.23	Yes
4	− 0.35	1.23	0.012	− 0.53	0.05	− 0.52	Yes
12	− 0.31	− 2.87	0.020	− 1.16	0.93	0.23	Yes
10	− 0.06	0.56	0.399	0.10	0.73	− 0.83	Yes
7	0.02	0.08	0.679	− 0.88	0.56	0.32	Yes
8	0.10	0.25	0.563	− 0.76	0.80	− 0.04	Yes
9	0.18	2.90	0.051	− 1.21	0.26	0.95	No
11	0.36	1.45	0.024	− 1.09	0.02	0.07	Yes
6	0.38	− 0.73	0.391	− 0.79	0.46	0.32	Yes
3	0.63	− 1.83	0.186	− 0.68	0.85	− 0.17	Yes
2	0.69	− 2.30	0.105	− 0.48	0.34	0.14	Yes

ASTA Arrhythmia-Specific questionnaire in Tachycardia and Arrhythmia, HRQoL Health-Related Quality of Life
^aItems are sorted in location order, from the easiest to the most difficult
^bResiduals ± 2.5 are marked in bold
^cThe Bonferroni corrected p values are p < 0.006 for the ASTA Symptom scale and p < 0.004 for the ASTA HRQoL scale