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Table 3 Plaque index (PI) change recorded at the first orthodontic checkup 1 month after professional cleaning and prophylaxis instruction

From: Oral hygiene compliance in orthodontic patients: a randomized controlled study on the effects of a post-treatment communication

  Communication group (n = 28 + n = 26) Control group (n = 30) Comparison (P)a
Plaque index
 Median, (Iqr) 0.3 (0.60) 0.75 (1.30) 0.0205
  1. Iqr interquartile range
  2. aTwo-sample Wilcoxon rank-sum (Mann–Whitney) test