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| 21. | The prevalence of 4 years old group was the highest; |
| 屈光不正有年龄特点(4岁组患病率高于其他年龄组); |
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| 22. | The prevalence rate of chronic diseases was 65.1%. |
| 结果 :老年人群慢性病的患病率为 65 1% ; |
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| 23. | The prevalence rate of periodontal disease was 86.49%. |
| ①有64个个体的500个牙齿患有牙周病,占观察牙齿总数的57.08%,该人群牙周病的平均患病率为86.49%。 |
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| 24. | (4) The prevalence of anemia among Chinese was slightly decreased. |
| （四）居民贫血患病率有所下降。 |
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| 25. | Sweden now has the lowest smoking prevalence in Europe. |
| 现在瑞典是欧洲吸烟率最低的国家。 |
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| 26. | ConclusionsThe Hefei rural area has a high prevalence of hypertension. |
| 结论合肥市农村地区高血压患病率较高。 |
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| 27. | (3) The malnutrition prevalence among the children was significantly decreased. |
| （三）儿童营养不良患病率显著下降。 |
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| 28. | I'm shocked at the prevalence of bribery among these officials. |
| 我对这些官员的普遍受贿感到震惊。 |
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| 29. | The prevalence of anemia among the Chinese people averages 15.2%; |
| 我国居民贫血患病率平均为15.2% |
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| 30. | The highest prevalence and numbers are in South-East Asia. |
| 东南亚维生素A缺乏症最流行，是患者人数最多的地区。 |
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