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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