Progress in Orthodontics

Table 2 Mean and standard deviation of treatment time according to the number of losses and number of arches involved

From: The impact of the loss of first permanent molars on the duration of treatment in patients treated with orthodontic space closure and without skeletal anchorage

		Number of losses				Dental Arches
	0 (n = 24)	1 (n = 2)	2 (n = 8)	3 (n = 6)	4 (n = 3)	1 (n = 9)	2 (n = 10)
Treatment Time	22.5	30.5	36.8	57.2	50.7	36.1	52.5
X ± SD	± 7.95	± 14.8	± 6.78	± 18.5	± 24.5	± 8.45	± 19.9

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