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Table 6 Self-Injection Assessment Questionnaire© version 1.1 (SIAQv1.1) reliability evaluations

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

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