Quality & Quantity (2007) 41:163–175 © Springer 2007
Development and Psychometric Analysis of an
Instrument to Measure the Reasons that
Oncological Patients give when Participating in a
CARMEN D. SOSA
, PEDRO PRIETO
, JUAN I. CAPAF
Department of Personality, Assessment and Psychological Treatments, University of La
Laguna, Sta. Cruz de Tenerife, Spain;
Department of Methodology of Behavioural Sciences,
University of La Laguna, Sta. Cruz de Tenerife, Spain
Abstract. This work presents the psychometric study of a questionnaire on participation in
psychological therapy (QPPT). The study is applied to oncological patients and the question-
naire was designed to evaluate the reasons given by chronic patients when participating or
not in programmes of psychological treatment.
The questionnaire includes six rational areas which resulted from the conﬁrmatory facto-
rial analysis. The internal consistency of the scales was analysed through Cronbach’s Alpha,
and their discriminatory capacity between criterion groups of oncological patients was tested
by means of t-tests and discriminant analyses. The results support, to a reasonable extent,
the reliability and validity of the QPPT as an instrument to evaluate the reasons of partici-
pation or refusal of psychological treatment in oncological patients.
Key words: cancer, assessment, psychological treatment, participation.
The acknowledgement of the inﬂuence that psychological factors have on
health-illness processes has generated a great amount of psychological
research in oncological disease in recent years. The scientiﬁc community
has begun a number of important studies with the aim of discovering more
about different biopsychosocial variables which are inﬂuential in cases of
The importance of psychological factors on health has been emphasized
by numerous studies (Selye, 1936; Engel, 1962; Lazarus, 1966; Lipowski,
Author for correspondence: Department of Personality, Assessment and Psychologi-
cal Treatments, University of La Laguna, Tenerife 38205, Spain, E-mail: email@example.com.