Table I.

Demographics and statistical comparisons of Herbst and Class II control subjects

Measurement	Herbst brachyfacial mean	SD	Herbst mesofacial mean	SD	Control mean	SD	P value
Age (y)	13.36	0.58	12.74	0.85	13.73	0.82	0.03*
Sex	4 female, 4 male	-	7 female, 1 male		6 female, 5 male	-	-
Phase 1 duration (mo)	7.21	1.41	7.93	2.23	-	-	0.46
Phase 2 duration (mo)	20.38	3.92	19.25	4.40	-	-	0.60
Total treatment time (mo)	27.59	4.31	27.18	5.78	22.81	8.69	0.25
ANB (°)	6.0	0.9	5.4	1.4	3.9	2.2	0.03†
Pog-N perp (mm)	−2.4	4.4	−3.8	6.1	−3.8	3.6	0.83
Gonial angle (Co-Go-Me) (°)	118.1	3.9	127.1	5.6	122.8	4.9	0.003‡
FMPA (°)	18.3	4.1	27.9	1.4	24.5	5.0	0.0002‡
Class II molar relationship (mm)	6.6	1.5	6.3	1.5	4.6	1.4	0.01§

^*Significant difference at P<0.05 for Herbst mesofacial vs control group only;

^†Significant difference at P<0.05 for Herbst brachyfacial vs control group only;

^‡Significant difference at P<0.05 for Herbst brachyfacial group vs Herbst mesofacial and control group;

^§Significant difference at P<0.05 for Herbst brachyfacial group and Herbst mesofacial vs control group.