Progress in Orthodontics

Table 3 Internal consistency of the answers of all rater groups for the three treatment groups, measured by Cronbach’s alpha, and influence of the deletion of each item by each subscale on Cronbach’s alpha values

From: Facial esthetic outcome of functional followed by fixed orthodontic treatment of class II division 1 patients

Group	Items	Cronbach’s alpha
Group	Items	Activator (if item deleted)	Twin block (if item deleted)	Control (if item deleted)	All (if item deleted)
Orthodontists	All	0.939	0.948	0.981	0.956
	Face	0.945*	0.931	0.978	0.952
	Lower face	0.905	0.921	0.976	0.933
	Upper lip	0.906	0.944	0.979	0.946
	Lower lip	0.932	0.957*	0.974	0.951
	Chin	0.933	0.928	0.972	0.945
Patients	All	0.770	0.886	0.873	0.855
	Face	0.707	0.830	0.822	0.798
	Lower face	0.826*	0.836	0.842	0.836
	Upper lip	0.627	0.871	0.833	0.810
	Lower lip	0.741	0.891*	0.879*	0.850
	Chin	0.717	0.877	0.845	0.826
Parents	All	0.951	0.953	0.974	0.960
	Face	0.951	0.938	0.962	0.952
	Lower face	0.929	0.933	0.968	0.945
	Upper lip	0.939	0.927	0.966	0.945
	Lower lip	0.930	0.939	0.963	0.944
	Chin	0.952*	0.968*	0.976*	0.963*
Laypersons	All	0.963	0.955	0.956	0.960
	Face	0.959	0.941	0.943	0.952
	Lower face	0.948	0.948	0.931	0.945
	Upper lip	0.954	0.936	0.959*	0.954
	Lower lip	0.955	0.947	0.957*	0.954
	Chin	0.956	0.952	0.933	0.949
All	All	0.936	0.933	0.950	0.941
	Face	0.932	0.911	0.936	0.929
	Lower face	0.922	0.905	0.935	0.923
	Upper lip	0.911	0.916	0.942	0.925
	Lower lip	0.920	0.927	0.942	0.931
	Chin	0.922	0.929	0.938	0.930

*Cases where item deletion resulted in increased Cronbach’s alpha value of the corresponding subscale

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