| 组别 | 例数 | 跌倒(n) | 未跌倒(n) | 跌倒发生率(‰) | 1级 | 2级 | 3级 |
| 实施前 | 2404 | 7 | 2397 | 0.078‰ | 6 | 0 | 1 |
| 实施后 | 2448 | 1 | 2447 | 0.025‰ | 1 | 0 | 0 |
| x2值 | 4.61 |
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| P值 | <0.05 |
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