Upper Airway Changes following Functional Treatment with the Headgear Herbst or Headgear Twin Block Appliance Assessed on Lateral Cephalograms and Magnetic Resonance Imaging

Table 1

Demographic data of the study subjects.

	Total	HG-Herbst	HG-TB
	(n)	(n)	(n)
Boys	9	4	5
Girls	17	9	8
Total	26	13	13
	Total	HG-Herbst	HG-TB	value
	(mean ± SD)	(mean ± SD)	(mean ± SD)
Age at baseline (year)	13.1 ± 1.5	13.5 ± 1.7	12.8 ± 1.3	0.128
Age after treatment (year)	14.2 ± 1.6	14.6 ± 1.9	13.8 ± 1.2	0.117
Duration of treatment (year)	1.1 ± 0.3	1.1 ± 0.2	1.1 ± 0.1	0.497