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 5 Differential item functioning for age and gender of the ASTA Symptom scale and ASTA Health-Related Quality of Life scale

Items	Differential item functioning for age^a		Differential item functioning for gender^a
Items	Uniform p value	Non-uniform p value	Uniform p value	Non-uniform p value
ASTA Symptom scale
1	0.017	0.041	0.342	0.456
2	0.691	0.697	0.005	0.059
3	0.248	0.066	0.364	0.081
4	0.054	0.541	0.826	0.232
5	0.087	0.046	0.854	0.297
6	0.015	0.040	0.427	0.701
7	0.714	0.688	0.062	0.012
8	0.583	0.795	0.291	0.007
9	0.011	0.045	0.907	0.004
ASTA HRQoL scale
1	0.215	0.147	0.165	0.031
2	0.324	0.759	0.182	0.052
3	0.504	0.985	0.762	0.844
4	0.007	0.037	0.210	0.643
5	0.150	0.043	0.534	0.813
6	0.871	0.710	0.797	0.339
7	0.054	0.145	0.110	0.346
8	0.136	0.646	0.204	0.453
9	0.451	0.945	0.111	0.453
10	0.285	0.882	0.002	0.033
11	0.005	0.030	0.581	0.301
12	0.680	0.519	0.395	0.403
13	0.015	0.047	0.082	0.206

ASTA Arrhythmia-Specific questionnaire in Tachycardia and Arrhythmia, HRQoL Health-Related Quality of Life
^aBased on a two-way ANOVA with Bonferroni corrected p values, p < 0.002 for the ASTA Symptom scale and the ASTA HRQoL scale