Page 34 - THE PERCEPT STUDY Illness Perceptions in Physiotherapy Edwin de Raaij

Chapter 2
Fifteen physiotherapists (mean age 41.2 years, SD 8.9, range 23-52) from private hysiotherapy practices tested ‘the pre-final version’ of the Brief IPQ-DLV. Self-administered time for scoring the Brief IPQ-DLV was a mean of 4.7 min (SD 1.3, range 3-7).
Reproducibility of the Brief IPQ-DLV
Twenty-seven patients with COPD, mean age of 63.7 (SD 9.2, range 43-80) years, participated in the reproducibility measurement. Table 2 summarizes their demographic characteristics At a time interval of 1 week, the dimensions Consequences, Concern and Emotional Response reached a Kw of 0.70. The dimensions, Personal Control, Treatment Control, Identity and Coherence did not reach the 0.70 reliability coefficient. At a time interval of 3 weeks, the dimensions Concern and Emotional Response reached the 0.70 reliability coefficient but the reliability of the other dimensions declined. The last question of Brief IPQ-DLV showed an 85 percent agreement at a time interval of 1 week and an 81 percent agreement at a time interval of 3 weeks.
Agreement was assessed for as well individual as for group evaluative purposes for the first 8 questions of the Brief IPQ-DLV. For individual purposes SDCindiv for the eight illness perception dimensions was between 2.45 and 3.37 points. For group evaluative purposes SDCgroup was between 0.47 and 0.57 points (Table 3). Table 3 summarizes reproduc ibility outcome.
Nineteen patients reported no change in health condition, four reported change during the reproducibility study and four did not respond. All patients filled out the complete Brief IPQ- DLV, so there were no missing items.
Concurrent validity of the Brief IPQ-DLV
A total of 163 patients, mean age of 48.8 years (SD 15.2, range 18-82) from 11 different physiotherapy private practices participated in the concurrent validity study. Table 4 summarizes their demographic characteristics.
The concurrent validity showed significant correlations existed for the dimensions Consequence, Personal Control, Concern, and Emotional Response. For the dimensions Treatment Control no significant correlation was found (Table 5).
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