Table 1 Transparency values of PUL, PUC, PUZ and PET (n = 5).

From: Impact of toothbrushing on aesthetic and mechanical properties of hydrophilic antibacterial coating materials for orthodontic clear retainers

Group

Mean

S.D.

Median

Min–max

PUL

96.49a

0.40

96.58

95.85–96.85

PUC

96.47a

0.29

96.37

96.23–96.96

PUZ

94.24b

1.52

93.74

92.55–95.85

PET

97.02a

0.31

96.94

96.70-97.47

Significance

**

  1. p values were calculated using the Kruskal–Wallis test for multiple comparisons, followed by post hoc comparisons using the Mann–Whitney U test with a Bonferroni adjustment of the alpha level. Superscript letters (a, b, c) indicate results of post hoc comparisons; groups sharing the same letter are not significantly different (p > 0.05). **p < 0.01.
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