Psychometric characteristics of the chronic Otitis media questionnaire 12 (COMQ – 12): stability of factor structure and replicability shown by the Serbian version

Table 5 Test-re-test reliability of total and factor scores from EFA before and after scaling

Item scaling & scoring	Raw Total, Unscaled	1st PC Total, Scaled	Scaled Fac1 Impact^a	Scaled Fac2 Hearing	Scaled Fac3 Ear symptoms
Scaled and scored as factors	0.989	0.983	0.968	0.924	0.944
Scaled, but scored as discrete item sets using high-loading items only	–	–	0.985	0.932	0.963

All reliabilities exceed the requirement for practical application, even those of the factors. Wider implications of reliability are addressed in the Discussion
^a Daily activities and healthcare uptake; name abbreviated for formatting

ISSN: 1477-7525