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Table 3 Cross-sectional results of the ASI domains

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

Domain N n (% at floor) n (% at ceiling) Cronbach’s alpha ICC Standardized effect-size
Pre-injection modulea
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
  1. ASI assessment of self-injection, ICC intraclass correlation coefficient
  2. 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)