Data from respondents were combined and the Kuder
Richardson formula 20 (KR-20) used to assess the mtemal
consistency of the PCQN The KR-20 formula is
appropnate for dichotomous true/Mse items (l=:nght.
© 1996 Blackwell Science Ltd, Joumal oJ Advanced Nursing, 23,126-137 131
M M Ross et al
0 = wTong/don't know) on knowledge tests (Fitz-Cibbon &
Moms 1987) The mtemal consistency of the 20-item quiz
was O 78, mdicatmg high internal consistency or homogeneity
for the quiz (Nunally 1978)