Progress in Orthodontics

Table 2 Descriptive statistics for age at the beginning of treatment

From: Analysis of pretreatment factors associated with stability in early class III treatment

	Total			Stable			Unstable			U test
Age	n	X	IQR	n	X	IQR	n	X	IQR	p
Age	75	8.50	2.08	55	8.42	1.92	20	9.54	2.96	.465

Mann-Whitney’s U test between the two groups (Statistical power was .840; Effect size d =0.8) (x median, IQR interquartile range)

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