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

Progress in Orthodontics

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

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

Intergroup comparison (Mini Hyrax versus Hyrax): Mann-Whitney test. Level of significance p < 0.05
Intragroup comparison (between pairs of time): Wilcoxon test. Level of significance p < 0.05.
Same letters: not significative statistical difference. Different letters: significant statistical
CI confidence interval