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Qualified rates of total bacterial counts of three DCUs (n = 19)
| Project | Group A | Group B | Group C | χ2 | P |
|---|---|---|---|---|---|
| Qualified | 13 | 19 | 19 | 13.41 | 0.001 |
| Unqualified | 6 | 0 | 0 |
Notes: Group A underwent shock treatment every 3 weeks, Group B underwent shock treatment every 2 weeks, Group C underwent shock treatment every week, the qualified standard is a total bacterial count not exceeding 100 CFU/ml.
