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Subjects’ failure in steps.
| Failed steps | No. of subjects | Proportion |
|---|---|---|
| Facing forward (CNP) | 0 | 0% |
| Bending over (stayed, CNP) | 0 | 0% |
| Shaking the head (CNP) | 0 | 0% |
| Wearing the mask again (CNP) | 0 | 0% |
| Wearing the mask again (step 5, CNP) | 1 | 3.0% |
| Normal breathing (CNC) | 2 | 6.5% |
| Deep breathing (CNC) | 2 | 6.5% |
| Moving the head side to side (CNC) | 9 | 29.0% |
| Moving the head up and down (CNC) | 2 | 6.5% |
| Talking (CNC) | 11 | 35.5% |
| Bending over (repetitive, CNC) | 2 | 6.5% |
| Normal breathing (CNC) | 2 | 6.5% |
| Total | 31 | 100% |
