Page 155 - THE PERCEPT STUDY Illness Perceptions in Physiotherapy Edwin de Raaij

Theme 1
Measurement Illness Perceptions
Research aim:
To cross-culturally adapt the nine-item IPQ-B English version into the IPQ-B Dutch Language Version (Brief IPQ-DLV), and to determine its face validity, content validity, reprducibility, and concurrent validity.
Summary of main findings
In chapter 2, the translation and cross-cultural adaptation of The Brief IPQ-DLV is present- ed. The original 9-item English version of the Brief IPQ was developed by Broadbent et al. in 20066. They state, that the previous 80-items IPQ-R from 200228, could be a burden for patients and clinicians for situations in which there is little time to administer a questionnaire or if the patient is very ill. A shorter version should have less burden on patients and admin- istration time.
The Brief IPQ-DLV is well understood by 93% of the participating patients (n=25), health care professionals (n=15) and 24 first-grade students. The research shows it takes less than 5 min (mean 4.4 sd 2.1 min.) to complete and score, meaning a minimum of burden for both phys- iotherapists and patients. The face and content validity were found to be acceptable and the reproducibility showed moderate to good reliability. The Brief IPQ-DLV, (scored on a scale 0-10) showed a Smallest Detectable Change, varying per IPs dimension, of <1 point for group evaluation measurement and 3-4 points for individual evaluation measurement. The concur- rent validity could only be assessed for five out of the 9 IP dimensions, indicating that this needs to be further investigated. Responsiveness and interpretation of the items by different patient groups have not been investigated yet. We do not recommend the use of a sum score for the IPQ-DLV.
Discussion
The Brief IPQ-DLV was adapted from the original English version IPQ-B using all stages for cross-cultural translation and adaptation recommended by Beaton et al. 2. Nevertheless, the content validity needs to be taken into consideration. Van Oort 37 reports in a think aloud study, that in using this questionnaire several problems were identified. The Identity, Personal Control, Illness Coherence, and Causal dimensions gave rise to misinterpretations indicating that there is a need to pay greater attention to the interpretation and comprehension of the IPQ items by patients. From their qualitative data, it can be stated that it is difficult for patients to answer only one single question about a cognitive/emotional dimension. For in-
General discussion
153
8