Skip to main content
Progress in Orthodontics

Table 4 Growth curve analysis coefficients

From: Evaluation of the stiffness characteristics of rapid palatal expander screws

Term

Estimate

Std. error

Statistic

Significance

α

−47

21

−2.2

*

β

85

6.9

12

*

γ

−7.1

0.96

−7.4

*

δ

0.19

0.04

4.8

*

4b i

40

25

1.6

 

β 4b

−56

7.3

−7.7

*

γ 4b

5.5

0.99

5.6

*

δ 4b

−0.16

0.04

−4.1

*

  1. The model was strength it  = α i  + 4b i  + β × t + β 4b  × t + γ × t 2 + γ 4b  × t 2 + δ × t 3 + δ 4b  × t 3 + ε it
  2. * = p value < 0.05
Back to article page