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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