Page 91 - Physical activity in recipients of solid organ transplantation - Edwin J. van Adrichem

Physical activity in recipients of solid organ transplantation
Barriers and motivators questionnaire
Component structure barriers
Internal consistency, as measured by Cronbach’s
scale were .86 and .91, respectively.
of the barrier scale and the motivator

ese levels of internal consistency did not notably
increase if any of the items were deleted. For both the barrier and the motivator items the
inter-item correlations within the component systematically tend to be higher compared to
those belonging to di

erent components (Appendix Tables 1 and 2).
An exploratory principal component analysis was performed on the 31 barrier items.
e
generalized cross-validation criterion indicated the optimal number of components to
account for most of the data variability at four barrier components.

e combination of
these four components explained 28.9% of the variance.

e components’ loadings after
rotation (95% CI), eigen values, cumulative variance, and the
alpha
(95% CI) per
component are shown in Table 2.

e items loading signi
following subscales: (1) Fear of negative e
expectations and self-con

cantly on the individual components suggested the

ects; (2) Physical limitations; (3) Low
dence; and (4) Lack of motivation or time. Nine of the 31
barrier items did not load signi
the component structure.

cantly on any of the four subscales and were excluded from

e analyses of internal consistency of the four suggested barrier subscales showed
that three subscales had an acceptable consistency (
motivation or time) exhibited questionable consistency (a
alpha
= .70-.80). One subscale (lack of
alpha
= .66).
Component structure motivators
Table 3.
alpha
A second exploratory principal component analysis was performed on the 23 motivator
items.

e generalized cross-validation criterion analysis indicated the optimal number of
components at four motivator components.

ese four motivator components explained
43.3% of the variance. Component loadings after rotation (95% CI), eigen values for each
component, the cumulative variance, and the
alpha
(95% CI) per component are shown in

e items loading signi

cantly on the individual components suggested the
following subscales: (1) Health and Physical outcomes; (2) External in

uences; (3) Groups
activities and

nancial resources; and (4) Psychological outcomes. Two of the 23 motivator
items did not load signi

cantly on any of the subscales and were not included in the
component structure.

good consistency (
e analyses of the internal consistency of the four suggested motivator subscales
showed that two subscales (‘health and physical outcomes’, and ‘external in
alpha
= >.80).

e other two subscales (‘group activities and

uences’) had

nancial
resources’, and ‘psychological outcomes’) had an acceptable consistency (
alpha
= .70-.80).
89.
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