Introduction
Methods
Sample and materials
Qualitative construct validation
NFI-MS
Data collection
Quantitative psychometric analysis
Measurement and the rasch model
External comparison
Results
Qualitative analysis
MS Framework | Stroke quotations |
---|---|
Subjective experience |
Basically just tiredness to the point where you’re worn out. Tired. Done in.
|
Tiredness all the time… Its just tiredness, constant tiredness
| |
Shattered. No energy. Whacked out. Weary.
| |
motor |
It just takes it out your body. You just want to lie down and you’re drained.
|
If I do anything, you know, anything physical. Or go to the shops. Really shatters me.
| |
cognitive |
I’m still not reading…I can’t concentrate on it.
|
It feels, sort, of, my eyes start going cos I’ve got to concentrate on the story.
| |
motivation, energy and need to rest |
If I know I’ve got something to do, I’m quite happy to get on and do it. But if I know its not that day then I’m tired and I can’t be bothered doing it…
|
But my fatigue is, when I get home here in my bedroom, I sort of give in then
| |
ll take my son to school, get back in the car and go home and I’ll go straight back to bed for a few hours. But if I’m busy of a morning, I’ll go to bed at lunchtime
| |
Sleep and behavioural response |
I’m really tired and just want to go to bed and sleep and not bother with anything
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Yes, well then the tiredness takes over. Basically I want to stay sitting down then and I’m weary
| |
Sometimes you feel like when you do get up you’re tired more’
|
Quantitative analysis
Subjects and non-responder analysis
responders | non-responders | |
---|---|---|
n | 282 | 717 |
mean age at questionnaire completion (SD, range) | 67.3 (13.4, 18–95) | – |
mean age at onset of last stroke (SD, range) | 66.5 (12.4, 18–93) | 70.9 (12.8, 16–102) |
male (%) | 61.3 | 45.8 |
mean months post stroke (SD, range) | 17.2 (11.4, 2–50) | – |
previous stroke (%) | 9.6 | 21.1 |
previous TIA (%) | 11.6 | 16.6 |
ischaemic stroke (%) | 78.7 | 75.3 |
working (%) | 16.5 | – |
median Stroke Impact Scale score (range) | 17 (0–64) | – |
very difficult or unable to climb one flight of stairs (%) | 25.9 | – |
very difficult or unable to dress top half of body (%) | 10.1 | – |
very difficult or unable to control bladder (%) | 8.3 | – |
very difficult or unable to transfer from bed to chair (%) | 5.2 | – |
Rasch analysis
Analysis Number | Analysis Name | Item Residual | Person Residual | Chi-Square | PSI | Unidimensional | |||
---|---|---|---|---|---|---|---|---|---|
t-test | |||||||||
(CI) | |||||||||
Mean
|
SD
|
Mean
|
SD
|
Value
|
p
| ||||
1 | Physical (8 items) | -0.379 | 1.011 | -0.547 | 1.415 | 21.4 | 0.922 | 0.89 | 5.98% |
(3.2-8.8) | |||||||||
2 | Cognitive (4 items) | -0.043 | 1.977 | -0.597 | 1.224 | 18.9 | 0.092 | 0.78 | 3.29% |
(0.4-6.2) | |||||||||
3 | Summary (10 items) | -0.357 | 1.156 | -0.622 | 1.551 | 52.8 | 0.085 | 0.89 | 5.0% |
(2.2-7.8) | |||||||||
4 | Diurnal – Initial (6 items) | -0.423 | 1.862 | -0.683 | 1.351 | 50.5 | 0.001 | 0.70 | 7.72% |
(5.1-10.4) | |||||||||
5 | Diurnal – Final (5 items) | -0.842 | 1.783 | -0.648 | 1.174 | 18.9 | 0.219 | 0.69 | 5.56% |
(2.8-8.3) | |||||||||
6 | Nocturnal Sleep (5 items) | 0.229 | 1.451 | -0.563 | 1.501 | 31.5 | 0.008 | 0.69 | 4.22% |
(1.4-7.0) | |||||||||
Acceptable Values
|
0
|
<1.4
|
0
|
<1.4
|
>0.05
a
|
>0.85
|
< 5.0% (Lower CI)
|
External construct validity
Test-retest
Raw score to interval scale conversion
Raw | Summary | Physical | Cognitive |
---|---|---|---|
Score | Scale | Scale | Scale |
0 | 0.00 | 0.00 | 0.00 |
1 | 2.34 | 1.97 | 1.46 |
2 | 4.05 | 3.43 | 2.69 |
3 | 5.29 | 4.51 | 3.73 |
4 | 6.31 | 5.42 | 4.70 |
5 | 7.22 | 6.24 | 5.60 |
6 | 8.05 | 7.00 | 6.43 |
7 | 8.83 | 7.73 | 7.21 |
8 | 9.59 | 8.45 | 7.98 |
9 | 10.32 | 9.16 | 8.78 |
10 | 11.05 | 9.88 | 9.65 |
11 | 11.77 | 10.61 | 10.71 |
12 | 12.49 | 11.35 | 12.00 |
13 | 13.22 | 12.13 | |
14 | 13.96 | 12.94 | |
15 | 14.70 | 13.78 | |
16 | 15.46 | 14.65 | |
17 | 16.24 | 15.53 | |
18 | 17.03 | 16.41 | |
19 | 17.83 | 17.29 | |
20 | 18.64 | 18.21 | |
21 | 19.44 | 19.21 | |
22 | 20.25 | 20.38 | |
23 | 21.06 | 21.93 | |
24 | 21.89 | 24.00 | |
25 | 22.75 | ||
26 | 23.67 | ||
27 | 24.71 | ||
28 | 25.95 | ||
29 | 27.66 | ||
30 | 30.00 |