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Table 4 Comparison between mean PI of different interventions groups with achieved effect size and power

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

Interventions groups comparison Mann-Whitney U test Achieved effect size Achieved power at α error probability 0.05
Test (formulation) versus placebo p < 0.0167 1.158 0.897
Test (formulation) versus CHX p < 0.0167 1.077 0.856
CHX versus placebo p > 0.0167 0.287 0.178