Table 2. Median and interquartile range of daily oral hygiene measures reported in the different groups.

Oral hygiene measure	Appliance-free Me (IQR)	Metal Ap. Me (IQR)	Non-metal Ap. Me (IQR)	P
Tooth brushing F.	3 (3 - 3)	3 (2 - 3)	3 (2 - 3)	0.8465
Use of dental floss F.	0 (0 - 1)	1 (0 - 1)	0 (0 - 1)	0.3189
Use of mouthwash F.	1 (0 - 1)	1 (0 - 2)	1 (1 - 2)	0.3189

Kruskal-Wallis test. F.: Frequency per day. Me: Median. IQR: Interquartile range.