Page 83 - THE PERCEPT STUDY Illness Perceptions in Physiotherapy Edwin de Raaij

Association of IPs with pain intensity and physical functioning
Univariate associations of IPs with pain intensity and physical functioning are reported In Table 3. The IP dimensions that were significantly correlated (p ≤ 0.10) with pain and physical function were added into the multiple linear regressions. The strength of the significant IP dimensions association with pain intensity varies; Identity r = 0.41, Consequences r = 0.36, Concern and Emotional r = 0.28, Timeline r = 0.18, Coherence r = 0.10. Also, the IP dimensions association with physical function varies: Consequences r = 0.48, Identity r = 0.47, Emotional r = 0.32, Concern r = 0.26, Timeline r = 0.23, Treatment Control
r =-0.16.
Multiple regression: pain intensity/physical functioning and illness perceptions.
For the independent variable pain intensity, the IP dimensions Personal Control and Treatment Control were not univariately significantly correlated and were therefore not added to the model. Also, for physical functioning, the IP dimension Personal Control was not added to the model. No multicollinearity was found between the IPs, and residuals were found to be distributed normally.
Table 4: Final model multiple linear regression of illness perceptions on pain intensity and physical functioning
A cross-sectional study
Illness perception dimensions
R2
Changed* R2
effect
95% CI
SE
p
Pain intensity
N = 607
22.9%
13.3%
Consequences
0.098
(0.005, 0.192)
0.127
0.04
Identity
0.273
(0.167, 0.378)
0.285
< 0.005
Coherence
0.084
(0.016, 0.152)
0.092
0.02
Physical functioning
N = 588
32.2%
26.5%
Consequences
0.283
(0.194, 0.372)
0.368
< 0.005
Treatment Control
- 0.113
(-0.194,-0.033)
- 0.107
0.01
Identity
0.240
(0.139, 0.340)
0.255
< 0.005
Concern
- 0.108
(-0.185,-0.030)
- 0.143
0.01
* = changed explained variance after adding illness perceptions to the model. SE = Standard Error
Effects adjusted for Age, Gender, ≥ 2 pain sites, pain duration, risk of: Distress, Depression, Somatization, and Anxiety Only significant illness perceptions are reported.
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