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Table 3 Mean and standard deviation of PI after treatment with the different interventions at 24 h after tooth polishing

From: Evaluation of Salvadora persica L. and green tea anti-plaque effect: a randomized controlled crossover clinical trial

Intervention Number Mean SD Kruskal-Wallis H test
Test (formulation) 14 0.931 ±0.372 p < 0.05
CHX 14 1.317 ±0.344
Placebo 14 1.440 ±0.498