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Comparison of treatment effect maintenance time between two groups.
| Group | 6-Month effective maintenance [n (%)] | 12-Month effective maintenance [n (%)] | Average maintenance time (months, x̄±s) | χ2 value | P Value |
|---|---|---|---|---|---|
| Study group | 41 (97.6) | 38 (90.5) | 10.8 ± 2.1 | 12.741 | <0.001 |
| Control group | 36 (85.7) | 24 (57.1) | 8.2 ± 2.8 | | |
