Diabetes Care, Vol 10, Issue 4 500-509, Copyright © 1987 by American Diabetes Association
Psychometric study of patient knowledge test
J Garrard, JO Joynes, L Mullen, L McNeil, C Mensing, C Feste and DD Etzwiler
The results of a psychometric study of the Test of Patient Knowledge are
reported. The 50-item, multiple-choice test, developed by Etzwiler and
associates at the International Diabetes Center, consists of a total score
and seven subscores based on seven nonoverlapping content categories:
nutrition, insulin, general knowledge, methods of control, pattern control,
exercise, and complications. The results described herein provide evidence
for the validity of the test (content, concurrent, and discriminant
validity), a high level of reliability (Cronbach's alpha = .88),
readability for the layperson at the 7th- to 8th-grade level, and
sensitivity to instructional gains. The literature on psychometric research
with other tests of patient knowledge of diabetes is reviewed and compared
with the results of this study.