Development and psychometric evaluation of the assessment of self-injection questionnaire: an adaptation of the self-injection assessment questionnaire

Table 3 Cross-sectional results of the ASI domains

Domain	N	n (% at floor)	n (% at ceiling)	Cronbach’s alpha	ICC	Standardized effect-size
Pre-injection module^a
Feelings about injection	68	18 (26.5)	0 (0.0)	0.83	–	–
Self-confidence	68	9 (13.2)	12 (17.6)	0.95	–	–
Post-injection module
Feelings about injection	67	23 (34.3)	0 (0.0)	0.88	0.78	− 0.03
Self-image	67	31 (46.3)	3 (4.5)	0.88	0.44	− 0.05
Self-confidence	67	12 (17.9)	25 (37.3)	0.98	0.50	0.29
Ease of use	67	0 (0.0)	19 (28.4)	0.96	0.59	0.09
Satisfaction	66	0 (0.0)	29 (43.9)	0.93	0.69	0.11

ASI assessment of self-injection, ICC intraclass correlation coefficient
^aThe Satisfaction domain of the pre-injection ASI module was not included in the pilot ASI administered in the RA0098 clinical study, thus it was not possible to assess the psychometric properties of this domain. Scores for each domain were between 0 (lowest possible i.e. floor) and 10 (highest possible i.e. ceiling)

ISSN: 1477-7525