4.
大环内酯类抗菌药物分布情况比较 [例（%）]
| 地区 | 例数 | 红霉素 | 阿奇霉素 |
| 华北 | 130 | 4(3.1) | 126(96.9) |
| 东北 | 218 | 96(44.0) | 122(56.0) |
| 华东 | 225 | 0(0) | 225(100) |
| 华南 | 115 | 6(5.2) | 109(94.8) |
| χ2值 | 202.405 | 202.405 | |
| P值 | < 0.001 | < 0.001 |
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