Table 3 Pattern matrix from EFA following oblimin rotation
DASH items (short description) | Factor 1 Physical Function | Factor 2 Biopsychosocial symptoms |
|---|---|---|
1 (Opening a jar) | − 0.7 |  |
2 (Writing) | − 0.51 |  |
3 (Turning a key) | − 0.65 |  |
4 (Meal preparation) | − 0.84 |  |
5 (Pushing open a door) | − 0.58 |  |
6 (Placing object overhead) | − 0.71 |  |
7 (Heavy household chores) | − 0.81 |  |
8 (Gardening) | − 0.85 |  |
9 (Making a bed) | − 0.74 |  |
10 (Carrying a bag) | − 0.66 |  |
11 (Carrying heavy object) | − 0.74 |  |
12 (Changing light bulb overhead) | − 0.76 |  |
13 (Wash and blow-dry hair) | − 0.84 |  |
14 (Back washing) | − 0.89 |  |
15 (Donning pullover jersey) | − 0.8 |  |
16 (Use knife to cut food) | − 0.82 |  |
17 (Recreational activities—little force) | − 0.8 |  |
18 (Recreational activities—some force) | − 0.9 |  |
19 (Recreational activities—moving arm freely) | − 0.9 |  |
20 (Transportation) | − 0.66 |  |
21 (Sexual activities) | − 0.58 |  |
22 (Interference with social activities) |  | − 0.59 |
23 (Interference with work) | − 0.32 | − 0.5 |
24 (Pain) |  | − 0.93 |
25 (Pain during activity) |  | − 0.82 |
26 (Pins and needles) |  | − 0.88 |
27 (Weakness) |  | − 0.81 |
28 (Stiffness) |  | − 0.69 |
29 (Sleeping) |  | − 0.74 |
30 (Psychosocial function) |  | − 0.6 |
Eigenvalue | 16.58 | 2.08 |
Percentage variance | 55% | 7% |
Cumulative percentage | 55% | 62% |
Cronbach’s alpha (95% CI) | 0.97 (0.96, 0.97) | 0.92 (0.90, 0.94) |