Page 30 - THE PERCEPT STUDY Illness Perceptions in Physiotherapy Edwin de Raaij

Chapter 2
change in their health condition due to their COPD in the last 4 weeks. Reproducibility was assessed with a time interval of one and three weeks and was administrated independently by physiotherapists of the rehabilitation program.
Concurrent validity
Was assessed in a group of patients who were recruited from 11 private physiotherapy prac- tices in The Netherlands. There were no exclusion criteria, but patients had to be able to read and comprehend the Dutch language. Patients completed a package of questionnaires assessing demographic items, the cross-culturally adapted Brief IPQ-DLV, and additional vali- dated Dutch questionnaires: The Illness- Cognition-Questionnaire9, Multidimensional Health Locus of Control scale12, Spielberger State-Trait Anxiety Inventory27 and the RAND-3628.
In order to find a Dutch validated equivalent questionnaire for each illness perception dimension the handbook of test research by Evers and colleagues was used8. Table 1 presents the questionnaires judged to be eligible for the assessment of concurrent validity. No validated Dutch questionnaires were found to assess concurrent validity of the dimensions Identity, Timeline, and Coherence. For the dimension consequences of the IPQ-B dimension the Illness-Cognition-Questionnaire9 was used.
Table 1: IP dimension with their Dutch validated equivalent.
IPQ-K DLV ZCLa ZCLb ZCLc MHLC d MHLC e STAI-DY f RAND g
Consequences X X
Timeline X X
Personal Control X
Treatment Control
Identity
Concern X
Coherence
Emotional respons X
a The Illness-Cognition-Questionnaire, subscale perceived benefit.
b The Illness-Cognition-Questionnaire, helplessness.
c The Illness-Cognition-Questionnaire, acceptance.
d Multidimensional Health Locus of Control scale, subscale internal orientation. e Multidimensional Health Locus of Control scale, subscale external orientation. f Spielberger State-trait anxiety inventory, subscale trait.
g RAND-36, subscale mental health.
For the dimensions personal Control and treatment Control of the IPQ-B dimensions the Multidimensional Health Locus of Control scale12 was used. For the dimensions Concern and Emotional Personal Controle of the IPQ-B dimension, the Spielberger State-Trait Anxiety
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