Cephalometric study to test the reliability of anteroposterior skeletal discrepancy indicators using the twin block appliance

Progress in Orthodontics

Table 6 Correlation coefficient and regression equation

Parameter	r	r ²	Equation	Standard error of the estimate
ANB angle	0.74	0.55	Y = 0.702*X − 1.645	0.95
Wits appraisal	0.33	0.11	Y = 0.291*X − 0.696	1.78
β angle	0.50	0.25	Y = 0.478*X + 18.549	2.68
APDI	0.47	0.22	Y = 0.482*X + 44.140	3.33
App-Bpp	0.66	0.43	Y = 0.513*X + 1.375	1.67
YEN angle	0.86	0.74	Y = 0.940*X + 11.697	2.70
W angle	0.81	0.65	Y = 0.801*X + 14.059	2.03

r, the multiple correlation coefficient; r ², the coefficient of determination, is the squared value of the multiple correlation coefficient.