Progress in Orthodontics

Table 2 Median and interquartile range values for measured clinical indices in both fiber-reinforced and spiral wire group

From: Clinical and radiographic comparison of the effects of two types of fixed retainers on periodontium - A randomized clinical trial

			Baseline		6 months		Pvalue
			Median	Interquartile range	Median	Interquartile range	Pvalue
Plaque index	SW	Maxilla	0.33	1	0.66	1	0.16
	SW	Mandible	0.33	1	0.91	1	0.077
	FRC	Maxilla	0.0	1	1.66	1	0.003*
	FRC	Mandible	0.91	1	2.0	0	0.001*
Gingival index	SW	Maxilla	0.0	0	0.83	1	0.01*
	SW	Mandible	0.16	1	0.41	1	0.56
	FRC	Maxilla	0.5	1	1.0	1	0.032*
	FRC	Mandible	0.33	2	1.0	1	0.021*
Calculus index	SW	Maxilla	0.0	0	0.0	1	1
	SW	Mandible	0.0	0	0.0	0	0.042*
	FRC	Maxilla	0.0	0	0.0	0	0.15
	FRC	Mandible	0.0	0	0.33	0	0.018*
Bleeding on probing	SW	Maxilla	0.0	0	0.5	1	0.045*
	SW	Mandible	0.0	1	0.33	1	0.16
	FRC	Maxilla	0.16	0	0.5	1	0.044*
	FRC	Mandible	0.0	1	0.66	1	0.025*

SW, spiral wire group; FRC, fiber-reinforced composite group.
*, statistically significant.

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