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Table 5 Intragroup and intergroup comparison of the pain perception using the visual analogical scale (VAS)

From: Mini Hyrax vs Hyrax expanders in the rapid palatal expansion in adolescents with posterior crossbite: a randomized controlled clinical trial

Observational times Groups Effect size
(95% CI)
p value
  Mini Hyrax Hyrax   
  Median Min–Max Mean Median Min–Max Mean   
24 h 45.30 0.00–96.80 37.35 A 35.57 0.00–91.84 38.96 A 0.05 (− 4.00–4.10) 0.847
48 h 27.19 0.00–91.37 35.46 A 27.72 0.00–83.44 31.06 A 0.16 (− 0.54–0.86) 0.653
72 h 15.77 0.00–93.56 25.63 AB 9.44 0.00–75.78 22.37 B 0.12 (− 0.58–0.82) 0.967
7 days 8.22 0.00–71.59 15.32 B 4.85 0.00–64.77 16.21 B 0.04 (− 3.23–3.31) 0.844
  1. Intergroup comparison (Mini Hyrax versus Hyrax): Mann-Whitney test. Level of significance p < 0.05
  2. Intragroup comparison (between pairs of time): Wilcoxon test. Level of significance p < 0.05.
  3. Same letters: not significative statistical difference. Different letters: significant statistical
  4. CI confidence interval