Table 4. Statistical table of sample with different independent variables.
| Independent variable | Number of samples | Sample proportion | I 2 |
| H | 14 | 18.42% | 98.4 |
| D | 10 | 13.16% | 77.4 |
| D2H | 28 | 37.04% | 93.5 |
| Other | 24 | 31.58% | 95.3 |
| Total | 76 | 100% |
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