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The correlation coefficient between each characteristic and the total score
| Characteristic | r | P value |
| Age | 0.299 | 0.000 |
| State of consciousness | 0.632 | 0.000 |
| Degree of understanding | 0.814 | 0.000 |
| Emotional state | 0.780 | 0.000 |
| Degree of cooperation | 0.843 | 0.000 |
| Tolerance degree of tubes | 0.653 | 0.000 |
| Number of tubes | 0.724 | 0.000 |
| Type of tubes | 0.684 | 0.000 |
| Fixation mode of tubes | 0.435 | 0.000 |
| Activity ability | 0.183 | 0.000 |
