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| Time (week) | χ2 (Group) | P | χ2 (Time) | P | |||||
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| one | two | three | four | five | 2 weeks after radiotherapy | ||||
| Control group | 5 | 5 | 8 | 12 | 15 | 6 | 3.898 | 0.048 | 16.543 | <0.001 |
| Experimental group | 4 | 4 | 7 | 16 | 5 | 4 |
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