Diabetes Care, Vol 23, Issue 6 765-769, Copyright © 2000 by American Diabetes Association
Diabetes Fear of Injecting and Self-Testing Questionnaire: a psychometric evaluation
ED Mollema, FJ Snoek, F Pouwer, RJ Heine and HM van der Ploeg
Institute for Research in Extramural Medicine (EMGO-Institute), Department of Medical Psychology, Vrije Universiteit, Amsterdam, The Netherlands. ed.mollema.emgo@med.vu.nl
OBJECTIVE: To study the psychometric properties of the Diabetes Fear of
Injecting and Self-Testing Questionnaire (D-FISQ). RESEARCH DESIGN AND
METHODS: Two groups of patients were studied. Sample A consisted of 252
insulin-treated diabetes patients. Sample B incorporated 24 insulin-treated
patients with high scores (> or = 95th percentile) on the D-FISQ.
Test-retest correlations were assessed in both samples. Discriminant and
convergent validity of the D-FISQ were assessed with questionnaires
concerning fear of hypoglycemia, trait anxiety, and fear of bodily injury,
illness, or death. To evaluate criterion-related validity, sample B
participated in a behavioral avoidance test (BAT), in which the current
level of avoidance of either self-injecting or self-testing was determined.
Exploratory factor analysis (EFA) was performed to study whether 2 factors
(fear of self-injecting [FSI] and fear of self-testing [FST]) could be
detected. RESULTS: Test-retest correlations ranged from 0.50 to 0.68 (P
< 0.001). Correlations between D-FISQ and fear of hypoglycemia, trait
anxiety, and fear of bodily injury, illness, or death ranged from 0.28 to
0.45 (P < 0.001). Patients who refused to do a BAT for self-injecting or
self-testing had higher scores on FSI (P = 0.095) and FST (P = 0.01). EFA
yielded 2 separate factors, FSI and FST. CONCLUSIONS: Results from this
study support reliability and validity of the D-FISQ, a self-report
instrument that can be used for both clinical and research purposes.