| Steps |
Independent variables |
β |
p |
R2 |
ΔR2 |
| 1 |
Age only – linear effect |
|
|
.001 |
.001 |
| |
Age – linear |
-.030 |
.766 |
|
|
| 2 |
Age only – quadratic effect |
|
|
.073 |
.072* |
| |
Age – linear
Age – quadratic |
-2.141
2.128 |
.007
.007 |
|
|
| 3 |
Add other socio-demographic variables |
|
|
.096 |
.023 |
| |
Age – linear |
-2.048 |
.010 |
|
|
| |
Age – quadratic |
2.019 |
.012 |
|
|
| |
Sex (reference=male) |
0.156 |
.122 |
|
|
| |
Work status (reference=not working) |
0.024 |
.843 |
|
|
| 4 |
Add clinical variables |
|
|
.457 |
.361* |
| |
Age – linear |
-1.770 |
.008 |
|
|
| |
Age – quadratic |
1.606 |
.015 |
|
|
| |
Sex (reference=male) |
0.144 |
.081 |
|
|
| |
Work status (reference=not working) |
0.070 |
.472 |
|
|
| |
Pre-stroke fatigue (reference=no) |
0.348 |
<.001 |
|
|
| |
Physical functioning (SF–36) |
-0.477 |
<.001 |
|
|
| |
ADL (Barthel Index ) |
0.174 |
.092 |
|
|
| |
Sleep quality (PSQI total score) |
0.004 |
.964 |
|
|
| |
Respiratory disease |
0.233 |
.005 |
|
|
| 5 |
Add depressive symptoms |
|
|
.491 |
.034* |
| |
Age – linear |
-1.295 |
.053 |
|
|
| |
Age – quadratic |
1.165 |
.080 |
|
|
| |
Sex (reference=male) |
0.127 |
.115 |
|
|
| |
Work status (reference=not working) |
0.072 |
.446 |
|
|
| |
Pre-stroke fatigue (reference=no) |
0.292 |
.001 |
|
|
| |
Physical functioning (SF–36) |
-0.454 |
<.001 |
|
|
| |
ADL (Barthel Index) |
0.144 |
.153 |
|
|
| |
Sleep quality (PSQI total) |
-0.058 |
.505 |
|
|
| |
Respiratory disease |
0.191 |
.019 |
|
|
| |
Depression (BDI–II score) |
0.223 |
.017 |
|
|
Note: FSS-7 = Fatigue Severity Scale 7 item version; ADL = Activities of Daily Living; PSQI = Pittsburgh Sleep Quality Index; BDI-II=Beck Depression Inventory II. The
model was significant (p<.05) at steps 2 through 5, but not at step 1. Test of final model: F(10,89)=8.58, p<.001), adjusted R