表3. 三组夹角呈N型的发生率比较.
| 组别 | 观察例数 | N型发生数 | 发生率（%） |
|---|---|---|---|
| 正常对照组 | 94 | 15 | 16.0 |
| MOVC组 | 68 | 33 | 48.5ab |
| 肝硬化组 | 86 | 14 | 16.3 |
注：a与正常对照组比较，P<0.01；b与肝硬化组比较，P<0.01
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