extremely significantp < 0.001
This qualitative impression is confirmed from the linear model fit and ANOVA results ( Table 1 A(i)), where it is seen that a) there is an extremely significant ( p < 0.001) change of D period with x for CTR b) a very significant ( p < 0.01) reduction in the D-period intercept (at x = 0) for CPL compared to CTR and c) no significant difference between the slopes ( p = 0.24).