Assessment of self-injection experience in patients with rheumatoid arthritis: psychometric validation of the Self-Injection Assessment Questionnaire (SIAQ)

Table 6 Self-Injection Assessment Questionnaire^© version 1.1 (SIAQ_v1.1) reliability evaluations

Domains	Proportion at floor (%)	Proportion at ceiling (%)	Cronbach's α coefficient	Intraclass correlation coefficient
PRE module
Feelings about injections	0.0	17.5	0.89	-
Self-confidence	3.1	1.0	0.82	-
Satisfaction with self-injection	2.1	14.4	-	-
POST module
Feelings about injections	0.0	27.8	0.92	0.93
Self-confidence	6.3	6.3	0.90	0.82
Injection-site reactions	0.0	24.0	0.89	0.86
Ease of use	0.0	21.6	0.85	0.79
Satisfaction with self-injection	0.0	4.1	0.90	0.89

ISSN: 1477-7525