Development of a questionnaire to measure health-related quality of life (HRQoL) in patients with atrial fibrillation (AF-QoL)

Table 5 Summary of the measurement properties

	AF-Qol40¹	AF-Qol18²	AF-Qol7³	AF-Qol11⁴
N° items	40	18	7	11
Score distribution
Observations	96	97	106	97
Mean	39.41	38.87	39.59	38.03
SD	20.48	21.53	26.58	23.69
Percentile 50	36.56	37.50	33.93	36.36
% score 0	1 (0.9%)	3 (2.7%)	4 (3.6%)	4 (3.6)
% score 100	0	0	2 (1.8%)	0
Item total correlation	0.40–0.76	0.45–0.76	0.74–0.85	0.56–0.76
Reliability	0.956	0.915	0.901	0.891
Rasch analysis
Person separation	3.89	2.55	2.12	2.17
Person reliability	0.94	0.87	0.82	0.82

ISSN: 1477-7525