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自变量赋值
Coding for independent variables
| Independent variables | Code |
| Gender | Male=1, Female=2 |
| Add dietary fiber | No=0, Yes=1 |
| Hypoproteinemia | No=0, Yes=1 |
| Using potassium preparation | No=0, Yes=1 |
| Using sedative drugs | No=0, Yes=1 |
| Using vasoactive drugs | No=0, Yes=1 |
