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| Pillows | Ratio |
| Prototype pillow | 18.1±3.462,3 |
| Memory foam | 13.93±1.201,3 |
| Polyester sponge | 11.38±1.511,2 |
1Significant difference as compared with the prototype pillow. 2Significant difference as compared with memory foam. 3Significant difference as compared with polyester sponge.
