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Orthodontic plaque index (OPI) on subject level (n) at baseline and the 8-day follow-up. Values in the table denote mean and standard deviations.
| Time | n | Test OPI | n | Placebo OPI | t-value | P |
|---|---|---|---|---|---|---|
| Baseline | 19 | 0.72 (0.70) | 16 | 1.12 (0.70) | −1.69 | NS |
| 8-Day follow-up | 14 | 0.49 (0.51) | 14 | 1.21 (0.74) | −2.98 | <0.05 |
Differences were tested with an unpaired two-sided t-test.
